From: Rich Felker <dalias@aerifal.cx>
Date: Tue, 12 Apr 2011 21:52:14 +0000 (-0400)
Subject: speed up threaded fork
X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=commitdiff_plain;h=e2915eeeea244d3818d5eb7532ed35c6cf43c8fd

speed up threaded fork

after fork, we have a new process and the pid is equal to the tid of
the new main thread. there is no need to make two separate syscalls to
obtain the same number.
---

diff --git a/src/process/fork.c b/src/process/fork.c
index 012b7ca5..07fb79ed 100644
--- a/src/process/fork.c
+++ b/src/process/fork.c
@@ -10,8 +10,7 @@ pid_t fork(void)
 	ret = syscall(SYS_fork);
 	if (libc.lock && !ret) {
 		pthread_t self = __pthread_self();
-		self->pid = syscall(SYS_getpid);
-		self->tid = syscall(SYS_gettid);
+		self->tid = self->pid = syscall(SYS_getpid);
 		libc.threads_minus_1 = 0;
 	}
 	if (libc.fork_handler) libc.fork_handler(!ret);