Add weak definitions for wrapped system calls. In general:

	_foo - wrapped system call
	foo - weak definition to _foo

and for cancellation points:

	_foo - wrapped system call
	__foo - enter cancellation point, call _foo(), leave
	        cancellation point
	foo - weak definition to __foo

Change use of global _thread_run to call a function to get the
currently running thread.

Make all pthread_foo functions weak definitions to _pthread_foo,
where _pthread_foo is the implementation.  This allows an application
to provide its own pthread functions.

Provide slightly different versions of pthread_mutex_lock and
pthread_mutex_init so that we can tell the difference between
a libc mutex and an application mutex.  Threads holding mutexes
internal to libc should never be allowed to exit, call signal
handlers, or cancel.

Approved by:	-arch

1 files changed, 6 insertions, 3 deletions

diff --git a/lib/libpthread/thread/thr_vfork.c b/lib/libpthread/thread/thr_vfork.c
index bbfcf00..78d9f01 100644
--- a/lib/libpthread/thread/thr_vfork.c
+++ b/lib/libpthread/thread/thr_vfork.c
@@ -1,9 +1,12 @@
+/*
+ * $FreeBSD$
+ */
 #include <unistd.h>
-#ifdef _THREAD_SAFE
+
+#pragma weak	vfork=_vfork
 
 int
-vfork(void)
+_vfork(void)
 {
 	return (fork());
 }
-#endif