Reimplement async procedures using pthreads

On Windows, async procedures have always been run in threads, and the
implementation used Windows specific APIs. Rewrite the code to use pthreads.

A new configuration option is introduced so that the threaded implementation
can also be used on POSIX systems. Since this option is intended only as
playground on POSIX, but is mandatory on Windows, the option is not
documented.

One detail is that on POSIX it is necessary to set FD_CLOEXEC on the pipe
handles. On Windows, this is not needed because pipe handles are not
inherited to child processes, and the new calls to set_cloexec() are
effectively no-ops.

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 23 insertions, 18 deletions

diff --git a/run-command.c b/run-command.c
index 0cd7f02ffe..77aefff2e2 100644
--- a/run-command.c
+++ b/run-command.c
@@ -82,6 +82,7 @@ static NORETURN void die_child(const char *err, va_list params)
 	write(child_err, "\n", 1);
 	exit(128);
 }
+#endif
 
 static inline void set_cloexec(int fd)
 {
@@ -89,7 +90,6 @@ static inline void set_cloexec(int fd)
 	if (flags >= 0)
 		fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
 }
-#endif
 
 static int wait_or_whine(pid_t pid, const char *argv0, int silent_exec_failure)
 {
@@ -447,11 +447,12 @@ int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const
 	return run_command(&cmd);
 }
 
-#ifdef WIN32
-static unsigned __stdcall run_thread(void *data)
+#ifdef ASYNC_AS_THREAD
+static void *run_thread(void *data)
 {
 	struct async *async = data;
-	return async->proc(async->proc_in, async->proc_out, async->data);
+	intptr_t ret = async->proc(async->proc_in, async->proc_out, async->data);
+	return (void *)ret;
 }
 #endif
 
@@ -497,7 +498,7 @@ int start_async(struct async *async)
 	else
 		proc_out = -1;
 
-#ifndef WIN32
+#ifndef ASYNC_AS_THREAD
 	/* Flush stdio before fork() to avoid cloning buffers */
 	fflush(NULL);
 
@@ -524,12 +525,18 @@ int start_async(struct async *async)
 	else if (async->out)
 		close(async->out);
 #else
+	if (proc_in >= 0)
+		set_cloexec(proc_in);
+	if (proc_out >= 0)
+		set_cloexec(proc_out);
 	async->proc_in = proc_in;
 	async->proc_out = proc_out;
-	async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL);
-	if (!async->tid) {
-		error("cannot create thread: %s", strerror(errno));
-		goto error;
+	{
+		int err = pthread_create(&async->tid, NULL, run_thread, async);
+		if (err) {
+			error("cannot create thread: %s", strerror(err));
+			goto error;
+		}
 	}
 #endif
 	return 0;
@@ -549,17 +556,15 @@ error:
 
 int finish_async(struct async *async)
 {
-#ifndef WIN32
-	int ret = wait_or_whine(async->pid, "child process", 0);
+#ifndef ASYNC_AS_THREAD
+	return wait_or_whine(async->pid, "child process", 0);
 #else
-	DWORD ret = 0;
-	if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0)
-		ret = error("waiting for thread failed: %lu", GetLastError());
-	else if (!GetExitCodeThread(async->tid, &ret))
-		ret = error("cannot get thread exit code: %lu", GetLastError());
-	CloseHandle(async->tid);
+	void *ret = (void *)(intptr_t)(-1);
+
+	if (pthread_join(async->tid, &ret))
+		error("pthread_join failed");
+	return (int)(intptr_t)ret;
 #endif
-	return ret;
 }
 
 int run_hook(const char *index_file, const char *name, ...)