author | Shawn Walker-Salas <shawn.walker@oracle.com> |
Thu, 21 Jan 2016 09:20:59 -0800 | |
changeset 5331 | 9c955076ffe3 |
permissions | -rw-r--r-- |
5331
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From 22469232670870cfd96fd257f3b99f6b649b0b4f Mon Sep 17 00:00:00 2001 |
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From: Russ Cox <[email protected]> |
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Date: Fri, 13 Nov 2015 16:21:01 -0500 |
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Subject: [PATCH 57/63] [release-branch.go1.5] runtime: fix bad signal stack |
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when using cgo-created threads and async signals |
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Cgo-created threads transition between having associated Go g's and m's and not. |
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A signal arriving during the transition could think it was safe and appropriate to |
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run Go signal handlers when it was in fact not. |
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Avoid the race by masking all signals during the transition. |
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Fixes #12277. |
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Change-Id: Ie9711bc1d098391d58362492197a7e0f5b497d14 |
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15 |
Reviewed-on: https://go-review.googlesource.com/16915 |
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16 |
Reviewed-by: Ian Lance Taylor <[email protected]> |
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17 |
Run-TryBot: Russ Cox <[email protected]> |
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TryBot-Result: Gobot Gobot <[email protected]> |
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Reviewed-on: https://go-review.googlesource.com/17141 |
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--- |
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src/runtime/os1_darwin.go | 17 ++++++++++++++--- |
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src/runtime/os1_dragonfly.go | 16 +++++++++++++--- |
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src/runtime/os1_freebsd.go | 17 ++++++++++++++--- |
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src/runtime/os1_linux.go | 17 ++++++++++++++--- |
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src/runtime/os1_nacl.go | 9 +++++++++ |
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src/runtime/os1_netbsd.go | 18 ++++++++++++++---- |
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src/runtime/os1_openbsd.go | 17 ++++++++++++++--- |
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src/runtime/os1_plan9.go | 6 ++++++ |
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src/runtime/os1_windows.go | 10 ++++++++++ |
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src/runtime/os3_solaris.go | 18 ++++++++++++++---- |
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src/runtime/proc1.go | 22 ++++++++++++++++++---- |
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11 files changed, 140 insertions(+), 27 deletions(-) |
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|
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diff --git a/src/runtime/os1_darwin.go b/src/runtime/os1_darwin.go |
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index e070229..c9dba15 100644 |
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--- a/src/runtime/os1_darwin.go |
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+++ b/src/runtime/os1_darwin.go |
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@@ -130,6 +130,7 @@ func mpreinit(mp *m) { |
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mp.gsignal.m = mp |
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} |
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|
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+//go:nosplit |
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func msigsave(mp *m) { |
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smask := (*uint32)(unsafe.Pointer(&mp.sigmask)) |
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if unsafe.Sizeof(*smask) > unsafe.Sizeof(mp.sigmask) { |
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@@ -138,6 +139,17 @@ func msigsave(mp *m) { |
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sigprocmask(_SIG_SETMASK, nil, smask) |
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} |
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|
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+//go:nosplit |
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+func msigrestore(mp *m) { |
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+ smask := (*uint32)(unsafe.Pointer(&mp.sigmask)) |
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+ sigprocmask(_SIG_SETMASK, smask, nil) |
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+} |
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+ |
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+//go:nosplit |
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+func sigblock() { |
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+ sigprocmask(_SIG_SETMASK, &sigset_all, nil) |
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+} |
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+ |
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// Called to initialize a new m (including the bootstrap m). |
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// Called on the new thread, can not allocate memory. |
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func minit() { |
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@@ -156,10 +168,8 @@ func minit() { |
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} |
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|
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// Called from dropm to undo the effect of an minit. |
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+//go:nosplit |
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func unminit() { |
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- _g_ := getg() |
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- smask := (*uint32)(unsafe.Pointer(&_g_.m.sigmask)) |
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- sigprocmask(_SIG_SETMASK, smask, nil) |
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signalstack(nil) |
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} |
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|
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@@ -459,6 +469,7 @@ func getsig(i int32) uintptr { |
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return *(*uintptr)(unsafe.Pointer(&sa.__sigaction_u)) |
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} |
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|
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+//go:nosplit |
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func signalstack(s *stack) { |
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var st stackt |
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if s == nil { |
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diff --git a/src/runtime/os1_dragonfly.go b/src/runtime/os1_dragonfly.go |
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index f96c78c..da70014 100644 |
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--- a/src/runtime/os1_dragonfly.go |
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+++ b/src/runtime/os1_dragonfly.go |
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@@ -119,6 +119,7 @@ func mpreinit(mp *m) { |
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mp.gsignal.m = mp |
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} |
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|
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+//go:nosplit |
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func msigsave(mp *m) { |
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smask := (*sigset)(unsafe.Pointer(&mp.sigmask)) |
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if unsafe.Sizeof(*smask) > unsafe.Sizeof(mp.sigmask) { |
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@@ -127,6 +128,17 @@ func msigsave(mp *m) { |
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sigprocmask(_SIG_SETMASK, nil, smask) |
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} |
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|
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+//go:nosplit |
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+func msigrestore(mp *m) { |
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+ smask := (*sigset)(unsafe.Pointer(&mp.sigmask)) |
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+ sigprocmask(_SIG_SETMASK, smask, nil) |
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+} |
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+ |
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+//go:nosplit |
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+func sigblock() { |
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+ sigprocmask(_SIG_SETMASK, &sigset_all, nil) |
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+} |
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+ |
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// Called to initialize a new m (including the bootstrap m). |
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// Called on the new thread, can not allocate memory. |
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113 |
func minit() { |
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114 |
@@ -150,9 +162,6 @@ func minit() { |
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115 |
|
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// Called from dropm to undo the effect of an minit. |
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func unminit() { |
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- _g_ := getg() |
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119 |
- smask := (*sigset)(unsafe.Pointer(&_g_.m.sigmask)) |
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- sigprocmask(_SIG_SETMASK, smask, nil) |
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signalstack(nil) |
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122 |
} |
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123 |
|
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@@ -222,6 +231,7 @@ func getsig(i int32) uintptr { |
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125 |
return sa.sa_sigaction |
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126 |
} |
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127 |
|
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128 |
+//go:nosplit |
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func signalstack(s *stack) { |
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130 |
var st sigaltstackt |
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131 |
if s == nil { |
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132 |
diff --git a/src/runtime/os1_freebsd.go b/src/runtime/os1_freebsd.go |
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133 |
index f3519f3..b18e60f 100644 |
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134 |
--- a/src/runtime/os1_freebsd.go |
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135 |
+++ b/src/runtime/os1_freebsd.go |
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136 |
@@ -118,6 +118,7 @@ func mpreinit(mp *m) { |
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137 |
mp.gsignal.m = mp |
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138 |
} |
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139 |
|
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140 |
+//go:nosplit |
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141 |
func msigsave(mp *m) { |
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142 |
smask := (*sigset)(unsafe.Pointer(&mp.sigmask)) |
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143 |
if unsafe.Sizeof(*smask) > unsafe.Sizeof(mp.sigmask) { |
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@@ -126,6 +127,17 @@ func msigsave(mp *m) { |
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145 |
sigprocmask(_SIG_SETMASK, nil, smask) |
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146 |
} |
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147 |
|
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148 |
+//go:nosplit |
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149 |
+func msigrestore(mp *m) { |
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150 |
+ smask := (*sigset)(unsafe.Pointer(&mp.sigmask)) |
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151 |
+ sigprocmask(_SIG_SETMASK, smask, nil) |
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152 |
+} |
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153 |
+ |
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154 |
+//go:nosplit |
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155 |
+func sigblock() { |
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156 |
+ sigprocmask(_SIG_SETMASK, &sigset_all, nil) |
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157 |
+} |
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158 |
+ |
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159 |
// Called to initialize a new m (including the bootstrap m). |
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160 |
// Called on the new thread, can not allocate memory. |
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161 |
func minit() { |
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162 |
@@ -151,10 +163,8 @@ func minit() { |
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163 |
} |
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164 |
|
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165 |
// Called from dropm to undo the effect of an minit. |
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166 |
+//go:nosplit |
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167 |
func unminit() { |
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168 |
- _g_ := getg() |
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169 |
- smask := (*sigset)(unsafe.Pointer(&_g_.m.sigmask)) |
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170 |
- sigprocmask(_SIG_SETMASK, smask, nil) |
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171 |
signalstack(nil) |
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172 |
} |
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173 |
|
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174 |
@@ -224,6 +234,7 @@ func getsig(i int32) uintptr { |
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175 |
return sa.sa_handler |
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176 |
} |
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177 |
|
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178 |
+//go:nosplit |
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179 |
func signalstack(s *stack) { |
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180 |
var st stackt |
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181 |
if s == nil { |
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182 |
diff --git a/src/runtime/os1_linux.go b/src/runtime/os1_linux.go |
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183 |
index 1cad8f7..166014b 100644 |
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184 |
--- a/src/runtime/os1_linux.go |
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|
185 |
+++ b/src/runtime/os1_linux.go |
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186 |
@@ -198,6 +198,7 @@ func mpreinit(mp *m) { |
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187 |
mp.gsignal.m = mp |
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188 |
} |
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189 |
|
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190 |
+//go:nosplit |
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|
191 |
func msigsave(mp *m) { |
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|
192 |
smask := (*sigset)(unsafe.Pointer(&mp.sigmask)) |
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|
193 |
if unsafe.Sizeof(*smask) > unsafe.Sizeof(mp.sigmask) { |
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194 |
@@ -206,6 +207,17 @@ func msigsave(mp *m) { |
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195 |
rtsigprocmask(_SIG_SETMASK, nil, smask, int32(unsafe.Sizeof(*smask))) |
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|
196 |
} |
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197 |
|
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198 |
+//go:nosplit |
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|
199 |
+func msigrestore(mp *m) { |
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200 |
+ smask := (*sigset)(unsafe.Pointer(&mp.sigmask)) |
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201 |
+ rtsigprocmask(_SIG_SETMASK, smask, nil, int32(unsafe.Sizeof(*smask))) |
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202 |
+} |
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|
203 |
+ |
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204 |
+//go:nosplit |
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|
205 |
+func sigblock() { |
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|
206 |
+ rtsigprocmask(_SIG_SETMASK, &sigset_all, nil, int32(unsafe.Sizeof(sigset_all))) |
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|
207 |
+} |
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208 |
+ |
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|
209 |
func gettid() uint32 |
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|
210 |
|
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211 |
// Called to initialize a new m (including the bootstrap m). |
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212 |
@@ -229,10 +241,8 @@ func minit() { |
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|
213 |
} |
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214 |
|
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215 |
// Called from dropm to undo the effect of an minit. |
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216 |
+//go:nosplit |
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|
217 |
func unminit() { |
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|
218 |
- _g_ := getg() |
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|
219 |
- smask := (*sigset)(unsafe.Pointer(&_g_.m.sigmask)) |
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220 |
- rtsigprocmask(_SIG_SETMASK, smask, nil, int32(unsafe.Sizeof(*smask))) |
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221 |
signalstack(nil) |
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|
222 |
} |
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|
223 |
|
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|
224 |
@@ -326,6 +336,7 @@ func getsig(i int32) uintptr { |
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|
225 |
return sa.sa_handler |
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} |
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|
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+//go:nosplit |
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func signalstack(s *stack) { |
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var st sigaltstackt |
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if s == nil { |
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diff --git a/src/runtime/os1_nacl.go b/src/runtime/os1_nacl.go |
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index 143752a..30c3529 100644 |
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--- a/src/runtime/os1_nacl.go |
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+++ b/src/runtime/os1_nacl.go |
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@@ -15,9 +15,18 @@ func mpreinit(mp *m) { |
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|
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func sigtramp() |
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|
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+//go:nosplit |
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func msigsave(mp *m) { |
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} |
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|
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+//go:nosplit |
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+func msigrestore(mp *m) { |
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+} |
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+ |
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+//go:nosplit |
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+func sigblock() { |
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+} |
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+ |
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// Called to initialize a new m (including the bootstrap m). |
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// Called on the new thread, can not allocate memory. |
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func minit() { |
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diff --git a/src/runtime/os1_netbsd.go b/src/runtime/os1_netbsd.go |
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index cacd606..f4c5ca4 100644 |
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--- a/src/runtime/os1_netbsd.go |
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+++ b/src/runtime/os1_netbsd.go |
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@@ -138,6 +138,7 @@ func mpreinit(mp *m) { |
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mp.gsignal.m = mp |
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} |
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|
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+//go:nosplit |
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func msigsave(mp *m) { |
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smask := (*sigset)(unsafe.Pointer(&mp.sigmask)) |
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if unsafe.Sizeof(*smask) > unsafe.Sizeof(mp.sigmask) { |
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@@ -146,6 +147,17 @@ func msigsave(mp *m) { |
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sigprocmask(_SIG_SETMASK, nil, smask) |
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269 |
} |
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|
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271 |
+//go:nosplit |
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+func msigrestore(mp *m) { |
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+ smask := (*sigset)(unsafe.Pointer(&mp.sigmask)) |
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+ sigprocmask(_SIG_SETMASK, smask, nil) |
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275 |
+} |
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276 |
+ |
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+//go:nosplit |
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278 |
+func sigblock() { |
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279 |
+ sigprocmask(_SIG_SETMASK, &sigset_all, nil) |
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280 |
+} |
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281 |
+ |
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282 |
// Called to initialize a new m (including the bootstrap m). |
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283 |
// Called on the new thread, can not allocate memory. |
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284 |
func minit() { |
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285 |
@@ -166,11 +178,8 @@ func minit() { |
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|
286 |
} |
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|
287 |
|
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288 |
// Called from dropm to undo the effect of an minit. |
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289 |
+//go:nosplit |
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290 |
func unminit() { |
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|
291 |
- _g_ := getg() |
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292 |
- smask := (*sigset)(unsafe.Pointer(&_g_.m.sigmask)) |
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293 |
- sigprocmask(_SIG_SETMASK, smask, nil) |
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294 |
- |
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295 |
signalstack(nil) |
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|
296 |
} |
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|
297 |
|
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298 |
@@ -213,6 +222,7 @@ func getsig(i int32) uintptr { |
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|
299 |
return sa.sa_sigaction |
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|
300 |
} |
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|
301 |
|
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|
302 |
+//go:nosplit |
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|
303 |
func signalstack(s *stack) { |
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|
304 |
var st sigaltstackt |
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|
305 |
if s == nil { |
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|
306 |
diff --git a/src/runtime/os1_openbsd.go b/src/runtime/os1_openbsd.go |
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|
307 |
index 24a095b..88f6aef 100644 |
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|
308 |
--- a/src/runtime/os1_openbsd.go |
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|
309 |
+++ b/src/runtime/os1_openbsd.go |
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|
310 |
@@ -148,6 +148,7 @@ func mpreinit(mp *m) { |
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|
311 |
mp.gsignal.m = mp |
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|
312 |
} |
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|
313 |
|
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|
314 |
+//go:nosplit |
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|
315 |
func msigsave(mp *m) { |
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|
316 |
smask := (*uint32)(unsafe.Pointer(&mp.sigmask)) |
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|
317 |
if unsafe.Sizeof(*smask) > unsafe.Sizeof(mp.sigmask) { |
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|
318 |
@@ -156,6 +157,17 @@ func msigsave(mp *m) { |
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|
319 |
*smask = sigprocmask(_SIG_BLOCK, 0) |
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|
320 |
} |
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|
321 |
|
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|
322 |
+//go:nosplit |
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|
323 |
+func msigrestore(mp *m) { |
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|
324 |
+ smask := *(*uint32)(unsafe.Pointer(&mp.sigmask)) |
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|
325 |
+ sigprocmask(_SIG_SETMASK, smask) |
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|
326 |
+} |
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|
327 |
+ |
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|
328 |
+//go:nosplit |
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|
329 |
+func sigblock() { |
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|
330 |
+ sigprocmask(_SIG_SETMASK, sigset_all) |
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|
331 |
+} |
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|
332 |
+ |
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|
333 |
// Called to initialize a new m (including the bootstrap m). |
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|
334 |
// Called on the new thread, can not allocate memory. |
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|
335 |
func minit() { |
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|
336 |
@@ -178,10 +190,8 @@ func minit() { |
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|
337 |
} |
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|
338 |
|
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|
339 |
// Called from dropm to undo the effect of an minit. |
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|
340 |
+//go:nosplit |
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|
341 |
func unminit() { |
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Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
342 |
- _g_ := getg() |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
343 |
- smask := *(*uint32)(unsafe.Pointer(&_g_.m.sigmask)) |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
344 |
- sigprocmask(_SIG_SETMASK, smask) |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
345 |
signalstack(nil) |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
346 |
} |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
347 |
|
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
348 |
@@ -224,6 +234,7 @@ func getsig(i int32) uintptr { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
349 |
return sa.sa_sigaction |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
350 |
} |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
351 |
|
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
352 |
+//go:nosplit |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
353 |
func signalstack(s *stack) { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
354 |
var st stackt |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
355 |
if s == nil { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
356 |
diff --git a/src/runtime/os1_plan9.go b/src/runtime/os1_plan9.go |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
357 |
index 9615b6d..38125a0 100644 |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
358 |
--- a/src/runtime/os1_plan9.go |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
359 |
+++ b/src/runtime/os1_plan9.go |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
360 |
@@ -21,6 +21,12 @@ func mpreinit(mp *m) { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
361 |
func msigsave(mp *m) { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
362 |
} |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
363 |
|
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
364 |
+func msigrestore(mp *m) { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
365 |
+} |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
366 |
+ |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
367 |
+func sigblock() { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
368 |
+} |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
369 |
+ |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
370 |
// Called to initialize a new m (including the bootstrap m). |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
371 |
// Called on the new thread, can not allocate memory. |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
372 |
func minit() { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
373 |
diff --git a/src/runtime/os1_windows.go b/src/runtime/os1_windows.go |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
374 |
index f608b4a..d012034 100644 |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
375 |
--- a/src/runtime/os1_windows.go |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
376 |
+++ b/src/runtime/os1_windows.go |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
377 |
@@ -284,9 +284,18 @@ func newosproc(mp *m, stk unsafe.Pointer) { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
378 |
func mpreinit(mp *m) { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
379 |
} |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
380 |
|
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
381 |
+//go:nosplit |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
382 |
func msigsave(mp *m) { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
383 |
} |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
384 |
|
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
385 |
+//go:nosplit |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
386 |
+func msigrestore(mp *m) { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
387 |
+} |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
388 |
+ |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
389 |
+//go:nosplit |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
390 |
+func sigblock() { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
391 |
+} |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
392 |
+ |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
393 |
// Called to initialize a new m (including the bootstrap m). |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
394 |
// Called on the new thread, can not allocate memory. |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
395 |
func minit() { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
396 |
@@ -296,6 +305,7 @@ func minit() { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
397 |
} |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
398 |
|
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
399 |
// Called from dropm to undo the effect of an minit. |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
400 |
+//go:nosplit |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
401 |
func unminit() { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
402 |
tp := &getg().m.thread |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
403 |
stdcall1(_CloseHandle, *tp) |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
404 |
diff --git a/src/runtime/os3_solaris.go b/src/runtime/os3_solaris.go |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
405 |
index 792188f..b27a675 100644 |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
406 |
--- a/src/runtime/os3_solaris.go |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
407 |
+++ b/src/runtime/os3_solaris.go |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
408 |
@@ -192,6 +192,7 @@ func mpreinit(mp *m) { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
409 |
|
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
410 |
func miniterrno() |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
411 |
|
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
412 |
+//go:nosplit |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
413 |
func msigsave(mp *m) { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
414 |
smask := (*sigset)(unsafe.Pointer(&mp.sigmask)) |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
415 |
if unsafe.Sizeof(*smask) > unsafe.Sizeof(mp.sigmask) { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
416 |
@@ -200,6 +201,17 @@ func msigsave(mp *m) { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
417 |
sigprocmask(_SIG_SETMASK, nil, smask) |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
418 |
} |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
419 |
|
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
420 |
+//go:nosplit |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
421 |
+func msigrestore(mp *m) { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
422 |
+ smask := (*sigset)(unsafe.Pointer(&mp.sigmask)) |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
423 |
+ sigprocmask(_SIG_SETMASK, smask, nil) |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
424 |
+} |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
425 |
+ |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
426 |
+//go:nosplit |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
427 |
+func sigblock() { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
428 |
+ sigprocmask(_SIG_SETMASK, &sigset_all, nil) |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
429 |
+} |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
430 |
+ |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
431 |
// Called to initialize a new m (including the bootstrap m). |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
432 |
// Called on the new thread, can not allocate memory. |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
433 |
func minit() { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
434 |
@@ -220,10 +232,6 @@ func minit() { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
435 |
|
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
436 |
// Called from dropm to undo the effect of an minit. |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
437 |
func unminit() { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
438 |
- _g_ := getg() |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
439 |
- smask := (*sigset)(unsafe.Pointer(&_g_.m.sigmask)) |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
440 |
- sigprocmask(_SIG_SETMASK, smask, nil) |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
441 |
- |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
442 |
signalstack(nil) |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
443 |
} |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
444 |
|
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
445 |
@@ -289,6 +297,7 @@ func getsig(i int32) uintptr { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
446 |
return *((*uintptr)(unsafe.Pointer(&sa._funcptr))) |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
447 |
} |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
448 |
|
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
449 |
+//go:nosplit |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
450 |
func signalstack(s *stack) { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
451 |
var st sigaltstackt |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
452 |
if s == nil { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
453 |
@@ -493,6 +502,7 @@ func sigaltstack(ss *sigaltstackt, oss *sigaltstackt) /* int32 */ { |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
454 |
sysvicall2(&libc_sigaltstack, uintptr(unsafe.Pointer(ss)), uintptr(unsafe.Pointer(oss))) |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
455 |
} |
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
456 |
|
9c955076ffe3
PSARC/2015/203 Google Go version 1.5
Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
457 |
+//go:nosplit |
9c955076ffe3
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458 |
func sigprocmask(how int32, set *sigset, oset *sigset) /* int32 */ { |
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459 |
sysvicall3(&libc_sigprocmask, uintptr(how), uintptr(unsafe.Pointer(set)), uintptr(unsafe.Pointer(oset))) |
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460 |
} |
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461 |
diff --git a/src/runtime/proc1.go b/src/runtime/proc1.go |
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462 |
index 54cb3eb..72ab524 100644 |
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463 |
--- a/src/runtime/proc1.go |
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464 |
+++ b/src/runtime/proc1.go |
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465 |
@@ -945,6 +945,15 @@ func needm(x byte) { |
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466 |
mp.needextram = mp.schedlink == 0 |
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467 |
unlockextra(mp.schedlink.ptr()) |
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|
468 |
|
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469 |
+ // Save and block signals before installing g. |
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|
470 |
+ // Once g is installed, any incoming signals will try to execute, |
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471 |
+ // but we won't have the sigaltstack settings and other data |
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|
472 |
+ // set up appropriately until the end of minit, which will |
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|
473 |
+ // unblock the signals. This is the same dance as when |
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474 |
+ // starting a new m to run Go code via newosproc. |
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475 |
+ msigsave(mp) |
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476 |
+ sigblock() |
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|
477 |
+ |
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478 |
// Install g (= m->g0) and set the stack bounds |
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|
479 |
// to match the current stack. We don't actually know |
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480 |
// how big the stack is, like we don't know how big any |
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481 |
@@ -956,7 +965,6 @@ func needm(x byte) { |
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482 |
_g_.stack.lo = uintptr(noescape(unsafe.Pointer(&x))) - 32*1024 |
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483 |
_g_.stackguard0 = _g_.stack.lo + _StackGuard |
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|
484 |
|
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485 |
- msigsave(mp) |
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486 |
// Initialize this thread to use the m. |
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|
487 |
asminit() |
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488 |
minit() |
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|
489 |
@@ -1027,9 +1035,6 @@ func newextram() { |
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|
490 |
// We may have to keep the current version on systems with cgo |
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parents:
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|
491 |
// but without pthreads, like Windows. |
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|
492 |
func dropm() { |
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parents:
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changeset
|
493 |
- // Undo whatever initialization minit did during needm. |
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parents:
diff
changeset
|
494 |
- unminit() |
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|
495 |
- |
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|
496 |
// Clear m and g, and return m to the extra list. |
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parents:
diff
changeset
|
497 |
// After the call to setg we can only call nosplit functions |
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parents:
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changeset
|
498 |
// with no pointer manipulation. |
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parents:
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|
499 |
@@ -1037,7 +1042,16 @@ func dropm() { |
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parents:
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|
500 |
mnext := lockextra(true) |
9c955076ffe3
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parents:
diff
changeset
|
501 |
mp.schedlink.set(mnext) |
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parents:
diff
changeset
|
502 |
|
9c955076ffe3
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parents:
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changeset
|
503 |
+ // Block signals before unminit. |
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parents:
diff
changeset
|
504 |
+ // Unminit unregisters the signal handling stack (but needs g on some systems). |
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parents:
diff
changeset
|
505 |
+ // Setg(nil) clears g, which is the signal handler's cue not to run Go handlers. |
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parents:
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changeset
|
506 |
+ // It's important not to try to handle a signal between those two steps. |
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parents:
diff
changeset
|
507 |
+ sigblock() |
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parents:
diff
changeset
|
508 |
+ unminit() |
9c955076ffe3
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parents:
diff
changeset
|
509 |
setg(nil) |
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parents:
diff
changeset
|
510 |
+ msigrestore(mp) |
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parents:
diff
changeset
|
511 |
+ |
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parents:
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changeset
|
512 |
+ // Commit the release of mp. |
9c955076ffe3
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parents:
diff
changeset
|
513 |
unlockextra(mp) |
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Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
514 |
} |
9c955076ffe3
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Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
515 |
|
9c955076ffe3
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Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
516 |
-- |
9c955076ffe3
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parents:
diff
changeset
|
517 |
2.6.1 |
9c955076ffe3
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Shawn Walker-Salas <shawn.walker@oracle.com>
parents:
diff
changeset
|
518 |