/* Stub for calling setenv */
void
x_cgo_setenv(char **arg)
{
	_cgo_tsan_acquire();
	setenv(arg[0], arg[1], 1);
	_cgo_tsan_release();
}

/* Stub for calling unsetenv */
void
x_cgo_unsetenv(char **arg)
{
	_cgo_tsan_acquire();
	unsetenv(arg[0]);
	_cgo_tsan_release();

	_cgo_tsan_acquire();
	p = mmap(addr, length, prot, flags, fd, offset);
	_cgo_tsan_release();
	if (p == MAP_FAILED) {
		/* This is what the Go code expects on failure.  */
		return (uintptr_t)errno;
	}
	return (uintptr_t)p;
}

void
x_cgo_munmap(void *addr, uintptr_t length) {
	int r;

	_cgo_tsan_acquire();
	r = munmap(addr, length);
	_cgo_tsan_release();
	if (r < 0) {

		}
		act.sa_flags = goact->flags;
	}

	ret = sigaction(signum, goact ? &act : NULL, oldgoact ? &oldact : NULL);
	if (ret == -1) {
		// runtime.sigaction expects _cgo_sigaction to return errno on error.
		_cgo_tsan_release();
		return errno;
	}

	if (oldgoact) {
		if (oldact.sa_flags & SA_SIGINFO) {
			oldgoact->handler = (uintptr_t)(oldact.sa_sigaction);
		} else {
			oldgoact->handler = (uintptr_t)(oldact.sa_handler);
		}

__attribute__ ((unused))
static void _cgo_tsan_acquire() {
	__tsan_acquire(&_cgo_sync);
}

__attribute__ ((unused))
static void _cgo_tsan_release() {
	__tsan_release(&_cgo_sync);
}

#else // !defined(CGO_TSAN)

#define _cgo_tsan_acquire()
#define _cgo_tsan_release()

	}

	ret = sigaction((int)signum, goact ? &act : NULL, oldgoact ? &oldact : NULL);
	if (ret == -1) {
		// runtime.rt_sigaction expects _cgo_sigaction to return errno on error.
		_cgo_tsan_release();
		return errno;
	}

	if (oldgoact) {
		if (oldact.sa_flags & SA_SIGINFO) {
			oldgoact->handler = (uintptr_t)(oldact.sa_sigaction);
		} else {
			oldgoact->handler = (uintptr_t)(oldact.sa_handler);
		}

	// bounds points into the Go stack. TSAN can't see the synchronization
	// in Go around stack reuse.
	_cgo_tsan_acquire();
	bounds[0] = (uintptr)addr - size;
	bounds[1] = (uintptr)addr;
	_cgo_tsan_release();

	}
}

extern void crosscall_ppc64(void (*fn)(void), void *g);

static void*
threadentry(void *v)
{
	ThreadStart ts;

	ts = *(ThreadStart*)v;
	_cgo_tsan_acquire();
	free(v);
	_cgo_tsan_release();

	// Save g for this thread in C TLS
	setg_gcc((void*)ts.g);

	crosscall_ppc64(ts.fn, (void*)ts.g);
	return nil;

	}
}

extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
static void*
threadentry(void *v)
{
	ThreadStart ts;

	ts = *(ThreadStart*)v;
	_cgo_tsan_acquire();
	free(v);
	_cgo_tsan_release();

	crosscall1(ts.fn, setg_gcc, (void*)ts.g);
	return nil;

/* Stub for creating a new thread */
void
x_cgo_thread_start(ThreadStart *arg)
{
	ThreadStart *ts;

	/* Make our own copy that can persist after we return. */
	_cgo_tsan_acquire();
	ts = malloc(sizeof *ts);
	_cgo_tsan_release();
	if(ts == nil) {
		fprintf(stderr, "runtime/cgo: out of memory in thread_start\n");
		abort();
	}
	*ts = *arg;

	_cgo_sys_thread_start(ts);	/* OS-dependent half */
}

#ifndef CGO_TSAN

	// bounds points into the Go stack. TSAN can't see the synchronization
	// in Go around stack reuse.
	_cgo_tsan_acquire();
	bounds[0] = (uintptr)addr;
	bounds[1] = (uintptr)addr + size;
	_cgo_tsan_release();