Adding upstream version 1.16.10.upstream/1.16.10upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 113 insertions, 0 deletions

diff --git a/src/runtime/cgo/gcc_libinit.c b/src/runtime/cgo/gcc_libinit.c
new file mode 100644
index 0000000..3304d95
--- /dev/null
+++ b/src/runtime/cgo/gcc_libinit.c
@@ -0,0 +1,113 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build cgo
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+
+#include <pthread.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h> // strerror
+#include <time.h>
+#include "libcgo.h"
+#include "libcgo_unix.h"
+
+static pthread_cond_t runtime_init_cond = PTHREAD_COND_INITIALIZER;
+static pthread_mutex_t runtime_init_mu = PTHREAD_MUTEX_INITIALIZER;
+static int runtime_init_done;
+
+// The context function, used when tracing back C calls into Go.
+static void (*cgo_context_function)(struct context_arg*);
+
+void
+x_cgo_sys_thread_create(void* (*func)(void*), void* arg) {
+	pthread_t p;
+	int err = _cgo_try_pthread_create(&p, NULL, func, arg);
+	if (err != 0) {
+		fprintf(stderr, "pthread_create failed: %s", strerror(err));
+		abort();
+	}
+}
+
+uintptr_t
+_cgo_wait_runtime_init_done(void) {
+	void (*pfn)(struct context_arg*);
+
+	pthread_mutex_lock(&runtime_init_mu);
+	while (runtime_init_done == 0) {
+		pthread_cond_wait(&runtime_init_cond, &runtime_init_mu);
+	}
+
+	// TODO(iant): For the case of a new C thread calling into Go, such
+	// as when using -buildmode=c-archive, we know that Go runtime
+	// initialization is complete but we do not know that all Go init
+	// functions have been run. We should not fetch cgo_context_function
+	// until they have been, because that is where a call to
+	// SetCgoTraceback is likely to occur. We are going to wait for Go
+	// initialization to be complete anyhow, later, by waiting for
+	// main_init_done to be closed in cgocallbackg1. We should wait here
+	// instead. See also issue #15943.
+	pfn = cgo_context_function;
+
+	pthread_mutex_unlock(&runtime_init_mu);
+	if (pfn != nil) {
+		struct context_arg arg;
+
+		arg.Context = 0;
+		(*pfn)(&arg);
+		return arg.Context;
+	}
+	return 0;
+}
+
+void
+x_cgo_notify_runtime_init_done(void* dummy __attribute__ ((unused))) {
+	pthread_mutex_lock(&runtime_init_mu);
+	runtime_init_done = 1;
+	pthread_cond_broadcast(&runtime_init_cond);
+	pthread_mutex_unlock(&runtime_init_mu);
+}
+
+// Sets the context function to call to record the traceback context
+// when calling a Go function from C code. Called from runtime.SetCgoTraceback.
+void x_cgo_set_context_function(void (*context)(struct context_arg*)) {
+	pthread_mutex_lock(&runtime_init_mu);
+	cgo_context_function = context;
+	pthread_mutex_unlock(&runtime_init_mu);
+}
+
+// Gets the context function.
+void (*(_cgo_get_context_function(void)))(struct context_arg*) {
+	void (*ret)(struct context_arg*);
+
+	pthread_mutex_lock(&runtime_init_mu);
+	ret = cgo_context_function;
+	pthread_mutex_unlock(&runtime_init_mu);
+	return ret;
+}
+
+// _cgo_try_pthread_create retries pthread_create if it fails with
+// EAGAIN.
+int
+_cgo_try_pthread_create(pthread_t* thread, const pthread_attr_t* attr, void* (*pfn)(void*), void* arg) {
+	int tries;
+	int err;
+	struct timespec ts;
+
+	for (tries = 0; tries < 20; tries++) {
+		err = pthread_create(thread, attr, pfn, arg);
+		if (err == 0) {
+			pthread_detach(*thread);
+			return 0;
+		}
+		if (err != EAGAIN) {
+			return err;
+		}
+		ts.tv_sec = 0;
+		ts.tv_nsec = (tries + 1) * 1000 * 1000; // Milliseconds.
+		nanosleep(&ts, nil);
+	}
+	return EAGAIN;
+}