ca56d57624
NetBSD's semaphores use the underlying lighweight process mechanism (LWP) on NetBSD, rather than pthreads. This means the m.prodcid needs to be set to the LWP ID rather than the pthread ID in order for unpark notifications to get sent to the right place. Introduce a new getProcID() method that selects the correct ID for the platform. Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/261742
89 lines
1.7 KiB
Go
89 lines
1.7 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package runtime
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import "unsafe"
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type mOS struct {
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waitsema uintptr // semaphore for parking on locks
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}
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func getProcID() uint64 {
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return uint64(gettid())
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}
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//extern malloc
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func libc_malloc(uintptr) unsafe.Pointer
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//go:noescape
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//extern sem_init
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func sem_init(sem *semt, pshared int32, value uint32) int32
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//go:noescape
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//extern sem_wait
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func sem_wait(sem *semt) int32
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//go:noescape
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//extern sem_post
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func sem_post(sem *semt) int32
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//go:noescape
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//extern sem_reltimedwait_np
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func sem_reltimedwait_np(sem *semt, timeout *timespec) int32
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//go:nosplit
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func semacreate(mp *m) {
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if mp.waitsema != 0 {
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return
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}
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var sem *semt
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// Call libc's malloc rather than malloc. This will
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// allocate space on the C heap. We can't call malloc
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// here because it could cause a deadlock.
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sem = (*semt)(libc_malloc(unsafe.Sizeof(*sem)))
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if sem_init(sem, 0, 0) != 0 {
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throw("sem_init")
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}
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mp.waitsema = uintptr(unsafe.Pointer(sem))
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}
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//go:nosplit
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func semasleep(ns int64) int32 {
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_m_ := getg().m
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if ns >= 0 {
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var ts timespec
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ts.setNsec(ns)
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if sem_reltimedwait_np((*semt)(unsafe.Pointer(_m_.waitsema)), &ts) != 0 {
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err := errno()
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if err == _ETIMEDOUT || err == _EAGAIN || err == _EINTR {
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return -1
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}
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throw("sem_reltimedwait_np")
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}
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return 0
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}
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for {
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r1 := sem_wait((*semt)(unsafe.Pointer(_m_.waitsema)))
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if r1 == 0 {
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break
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}
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if errno() == _EINTR {
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continue
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}
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throw("sem_wait")
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}
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return 0
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}
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//go:nosplit
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func semawakeup(mp *m) {
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if sem_post((*semt)(unsafe.Pointer(mp.waitsema))) != 0 {
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throw("sem_post")
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}
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}
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