diff options
Diffstat (limited to 'lib/libc/stdlib/exit.c')
| -rw-r--r-- | lib/libc/stdlib/exit.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/lib/libc/stdlib/exit.c b/lib/libc/stdlib/exit.c index 111b735be0a0..16631fad5b90 100644 --- a/lib/libc/stdlib/exit.c +++ b/lib/libc/stdlib/exit.c @@ -29,12 +29,9 @@ * SUCH DAMAGE. */ -#if defined(LIBC_SCCS) && !defined(lint) -static char sccsid[] = "@(#)exit.c 8.1 (Berkeley) 6/4/93"; -#endif /* LIBC_SCCS and not lint */ -#include <sys/cdefs.h> #include "namespace.h" #include <stdlib.h> +#include <pthread.h> #include <unistd.h> #include "un-namespace.h" @@ -52,6 +49,20 @@ void (*__cleanup)(void); */ int __isthreaded = 0; +static pthread_mutex_t exit_mutex; +static pthread_once_t exit_mutex_once = PTHREAD_ONCE_INIT; + +static void +exit_mutex_init_once(void) +{ + pthread_mutexattr_t ma; + + _pthread_mutexattr_init(&ma); + _pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_RECURSIVE); + _pthread_mutex_init(&exit_mutex, &ma); + _pthread_mutexattr_destroy(&ma); +} + /* * Exit, flushing stdio buffers if necessary. */ @@ -63,6 +74,12 @@ exit(int status) _thread_autoinit_dummy_decl = 1; + /* Make exit(3) thread-safe */ + if (__isthreaded) { + _once(&exit_mutex_once, exit_mutex_init_once); + _pthread_mutex_lock(&exit_mutex); + } + /* * We're dealing with cleaning up thread_local destructors in the case of * the process termination through main() exit. |