66 lines
1.8 KiB
Go
66 lines
1.8 KiB
Go
// SPDX-License-Identifier: Apache-2.0
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// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
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//go:build darwin || freebsd || linux
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package fakecgo
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import (
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"syscall"
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"unsafe"
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)
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var (
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pthread_g pthread_key_t
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runtime_init_cond = PTHREAD_COND_INITIALIZER
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runtime_init_mu = PTHREAD_MUTEX_INITIALIZER
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runtime_init_done int
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)
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//go:nosplit
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func x_cgo_notify_runtime_init_done() {
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pthread_mutex_lock(&runtime_init_mu)
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runtime_init_done = 1
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pthread_cond_broadcast(&runtime_init_cond)
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pthread_mutex_unlock(&runtime_init_mu)
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}
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// Store the g into a thread-specific value associated with the pthread key pthread_g.
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// And pthread_key_destructor will dropm when the thread is exiting.
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func x_cgo_bindm(g unsafe.Pointer) {
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// We assume this will always succeed, otherwise, there might be extra M leaking,
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// when a C thread exits after a cgo call.
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// We only invoke this function once per thread in runtime.needAndBindM,
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// and the next calls just reuse the bound m.
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pthread_setspecific(pthread_g, g)
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}
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// _cgo_try_pthread_create retries pthread_create if it fails with
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// EAGAIN.
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//
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//go:nosplit
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//go:norace
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func _cgo_try_pthread_create(thread *pthread_t, attr *pthread_attr_t, pfn unsafe.Pointer, arg *ThreadStart) int {
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var ts syscall.Timespec
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// tries needs to be the same type as syscall.Timespec.Nsec
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// but the fields are int32 on 32bit and int64 on 64bit.
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// tries is assigned to syscall.Timespec.Nsec in order to match its type.
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tries := ts.Nsec
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var err int
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for tries = 0; tries < 20; tries++ {
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err = int(pthread_create(thread, attr, pfn, unsafe.Pointer(arg)))
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if err == 0 {
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pthread_detach(*thread)
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return 0
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}
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if err != int(syscall.EAGAIN) {
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return err
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}
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ts.Sec = 0
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ts.Nsec = (tries + 1) * 1000 * 1000 // Milliseconds.
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nanosleep(&ts, nil)
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}
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return int(syscall.EAGAIN)
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}
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