Windows: Implement asynchronous functions as threads.

diff --git a/run-command.c b/run-command.c
index 743757c36ec0e5667fd8af28800ac095f1581adb..63238e412a401359d17fabaa2711e3750adca86c 100644 (file)
--- a/run-command.c
+++ b/run-command.c
@@ -65,21 +65,8 @@ int start_command(struct child_process *cmd)
                cmd->err = fderr[0];
        }
 
+#ifndef __MINGW32__
        cmd->pid = fork();
-       if (cmd->pid < 0) {
-               if (need_in)
-                       close_pair(fdin);
-               else if (cmd->in)
-                       close(cmd->in);
-               if (need_out)
-                       close_pair(fdout);
-               else if (cmd->out)
-                       close(cmd->out);
-               if (need_err)
-                       close_pair(fderr);
-               return -ERR_RUN_COMMAND_FORK;
-       }
-
        if (!cmd->pid) {
                if (cmd->no_stdin)
                        dup_devnull(0);
@@ -91,6 +78,13 @@ int start_command(struct child_process *cmd)
                        close(cmd->in);
                }
 
+               if (cmd->no_stderr)
+                       dup_devnull(2);
+               else if (need_err) {
+                       dup2(fderr[1], 2);
+                       close_pair(fderr);
+               }
+
                if (cmd->no_stdout)
                        dup_devnull(1);
                else if (cmd->stdout_to_stderr)
@@ -103,13 +97,6 @@ int start_command(struct child_process *cmd)
                        close(cmd->out);
                }
 
-               if (cmd->no_stderr)
-                       dup_devnull(2);
-               else if (need_err) {
-                       dup2(fderr[1], 2);
-                       close_pair(fderr);
-               }
-
                if (cmd->dir && chdir(cmd->dir))
                        die("exec %s: cd to %s failed (%s)", cmd->argv[0],
                            cmd->dir, strerror(errno));
@@ -128,6 +115,88 @@ int start_command(struct child_process *cmd)
                }
                die("exec %s failed.", cmd->argv[0]);
        }
+#else
+       int s0 = -1, s1 = -1, s2 = -1;  /* backups of stdin, stdout, stderr */
+       const char *sargv0 = cmd->argv[0];
+       char **env = environ;
+       struct strbuf git_cmd;
+
+       if (cmd->no_stdin) {
+               s0 = dup(0);
+               dup_devnull(0);
+       } else if (need_in) {
+               s0 = dup(0);
+               dup2(fdin[0], 0);
+       } else if (cmd->in) {
+               s0 = dup(0);
+               dup2(cmd->in, 0);
+       }
+
+       if (cmd->no_stderr) {
+               s2 = dup(2);
+               dup_devnull(2);
+       } else if (need_err) {
+               s2 = dup(2);
+               dup2(fderr[1], 2);
+       }
+
+       if (cmd->no_stdout) {
+               s1 = dup(1);
+               dup_devnull(1);
+       } else if (cmd->stdout_to_stderr) {
+               s1 = dup(1);
+               dup2(2, 1);
+       } else if (need_out) {
+               s1 = dup(1);
+               dup2(fdout[1], 1);
+       } else if (cmd->out > 1) {
+               s1 = dup(1);
+               dup2(cmd->out, 1);
+       }
+
+       if (cmd->dir)
+               die("chdir in start_command() not implemented");
+       if (cmd->env) {
+               env = copy_environ();
+               for (; *cmd->env; cmd->env++)
+                       env = env_setenv(env, *cmd->env);
+       }
+
+       if (cmd->git_cmd) {
+               strbuf_init(&git_cmd, 0);
+               strbuf_addf(&git_cmd, "git-%s", cmd->argv[0]);
+               cmd->argv[0] = git_cmd.buf;
+       }
+
+       cmd->pid = spawnvpe(_P_NOWAIT, cmd->argv[0], cmd->argv, (const char **)env);
+
+       if (cmd->env)
+               free_environ(env);
+       if (cmd->git_cmd)
+               strbuf_release(&git_cmd);
+
+       cmd->argv[0] = sargv0;
+       if (s0 >= 0)
+               dup2(s0, 0), close(s0);
+       if (s1 >= 0)
+               dup2(s1, 1), close(s1);
+       if (s2 >= 0)
+               dup2(s2, 2), close(s2);
+#endif
+
+       if (cmd->pid < 0) {
+               if (need_in)
+                       close_pair(fdin);
+               else if (cmd->in)
+                       close(cmd->in);
+               if (need_out)
+                       close_pair(fdout);
+               else if (cmd->out)
+                       close(cmd->out);
+               if (need_err)
+                       close_pair(fderr);
+               return -ERR_RUN_COMMAND_FORK;
+       }
 
        if (need_in)
                close(fdin[0]);
@@ -219,13 +288,23 @@ int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const
        return run_command(&cmd);
 }
 
+#ifdef __MINGW32__
+static __stdcall unsigned run_thread(void *data)
+{
+       struct async *async = data;
+       return async->proc(async->fd_for_proc, async->data);
+}
+#endif
+
 int start_async(struct async *async)
 {
        int pipe_out[2];
 
        if (pipe(pipe_out) < 0)
                return error("cannot create pipe: %s", strerror(errno));
+       async->out = pipe_out[0];
 
+#ifndef __MINGW32__
        async->pid = fork();
        if (async->pid < 0) {
                error("fork (async) failed: %s", strerror(errno));
@@ -236,16 +315,33 @@ int start_async(struct async *async)
                close(pipe_out[0]);
                exit(!!async->proc(pipe_out[1], async->data));
        }
-       async->out = pipe_out[0];
        close(pipe_out[1]);
+#else
+       async->fd_for_proc = pipe_out[1];
+       async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL);
+       if (!async->tid) {
+               error("cannot create thread: %s", strerror(errno));
+               close_pair(pipe_out);
+               return -1;
+       }
+#endif
        return 0;
 }
 
 int finish_async(struct async *async)
 {
+#ifndef __MINGW32__
        int ret = 0;
 
        if (wait_or_whine(async->pid))
                ret = error("waitpid (async) failed");
+#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);
+#endif
        return ret;
 }