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runtime: tricky replacements of _g_ in os3_solaris.go

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The argument to semacreate is always getg().m.

Change-Id: I4c4104cd6b57ab6b9ed0b7d11b8089bcc9fdd621
Reviewed-on: https://go-review.googlesource.com/c/go/+/418583
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Michael Pratt 2022-07-20 11:48:43 -04:00
parent 54a0ab3f7b
commit b486518964
1 changed files with 7 additions and 8 deletions
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15
src/runtime/os3_solaris.go
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@ -308,18 +308,17 @@ func semacreate(mp *m) {
}
var sem *semt
_g_ := getg()
// Call libc's malloc rather than malloc. This will
// allocate space on the C heap. We can't call malloc
// here because it could cause a deadlock.
_g_.m.libcall.fn = uintptr(unsafe.Pointer(&libc_malloc))
_g_.m.libcall.n = 1
_g_.m.scratch = mscratch{}
_g_.m.scratch.v[0] = unsafe.Sizeof(*sem)
_g_.m.libcall.args = uintptr(unsafe.Pointer(&_g_.m.scratch))
asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&_g_.m.libcall))
sem = (*semt)(unsafe.Pointer(_g_.m.libcall.r1))
mp.libcall.fn = uintptr(unsafe.Pointer(&libc_malloc))
mp.libcall.n = 1
mp.scratch = mscratch{}
mp.scratch.v[0] = unsafe.Sizeof(*sem)
mp.libcall.args = uintptr(unsafe.Pointer(&mp.scratch))
asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&mp.libcall))
sem = (*semt)(unsafe.Pointer(mp.libcall.r1))
if sem_init(sem, 0, 0) != 0 {
throw("sem_init")
}