mirror of https://github.com/golang/go.git
87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
// Copyright 2015 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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// +build cgo
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// +build darwin dragonfly freebsd linux netbsd solaris
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h> // strerror
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#include "libcgo.h"
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static pthread_cond_t runtime_init_cond = PTHREAD_COND_INITIALIZER;
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static pthread_mutex_t runtime_init_mu = PTHREAD_MUTEX_INITIALIZER;
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static int runtime_init_done;
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// The context function, used when tracing back C calls into Go.
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static void (*cgo_context_function)(struct context_arg*);
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void
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x_cgo_sys_thread_create(void* (*func)(void*), void* arg) {
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pthread_t p;
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int err = pthread_create(&p, NULL, func, arg);
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if (err != 0) {
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fprintf(stderr, "pthread_create failed: %s", strerror(err));
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abort();
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}
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}
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uintptr_t
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_cgo_wait_runtime_init_done() {
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void (*pfn)(struct context_arg*);
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pthread_mutex_lock(&runtime_init_mu);
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while (runtime_init_done == 0) {
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pthread_cond_wait(&runtime_init_cond, &runtime_init_mu);
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}
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// TODO(iant): For the case of a new C thread calling into Go, such
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// as when using -buildmode=c-archive, we know that Go runtime
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// initialization is complete but we do not know that all Go init
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// functions have been run. We should not fetch cgo_context_function
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// until they have been, because that is where a call to
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// SetCgoTraceback is likely to occur. We are going to wait for Go
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// initialization to be complete anyhow, later, by waiting for
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// main_init_done to be closed in cgocallbackg1. We should wait here
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// instead. See also issue #15943.
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pfn = cgo_context_function;
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pthread_mutex_unlock(&runtime_init_mu);
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if (pfn != nil) {
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struct context_arg arg;
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arg.Context = 0;
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(*pfn)(&arg);
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return arg.Context;
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}
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return 0;
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}
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void
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x_cgo_notify_runtime_init_done(void* dummy) {
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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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// Sets the context function to call to record the traceback context
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// when calling a Go function from C code. Called from runtime.SetCgoTraceback.
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void x_cgo_set_context_function(void (*context)(struct context_arg*)) {
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pthread_mutex_lock(&runtime_init_mu);
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cgo_context_function = context;
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pthread_mutex_unlock(&runtime_init_mu);
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}
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// Gets the context function.
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void (*(_cgo_get_context_function(void)))(struct context_arg*) {
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void (*ret)(struct context_arg*);
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pthread_mutex_lock(&runtime_init_mu);
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ret = cgo_context_function;
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pthread_mutex_unlock(&runtime_init_mu);
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return ret;
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}
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