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, 4 deletions

diff --git a/lib/libpthread/thread/thr_single_np.c b/lib/libpthread/thread/thr_single_np.c
index d6ecb48..52cd6ed 100644
--- a/lib/libpthread/thread/thr_single_np.c
+++ b/lib/libpthread/thread/thr_single_np.c
@@ -32,14 +32,16 @@
  * $FreeBSD$
  */
 #include <string.h>
-#ifdef _THREAD_SAFE
 #include <pthread.h>
 #include "pthread_private.h"
 
-int pthread_single_np()
+#pragma weak	pthread_single_np=_pthread_single_np
+
+int _pthread_single_np()
 {
+	struct pthread	*curthread = _get_curthread();
+
 	/* Enter single-threaded (non-POSIX) scheduling mode: */
-	_thread_single = _thread_run;
+	_thread_single = curthread;
 	return(0);
 }
-#endif