add proper fuxed-based locking for stdio

[musl] / src / thread / pthread_create.c

diff --git a/src/thread/pthread_create.c b/src/thread/pthread_create.c
index 856015f..adef510 100644 (file)
--- a/src/thread/pthread_create.c
+++ b/src/thread/pthread_create.c
@@ -1,4 +1,5 @@
 #include "pthread_impl.h"
+#include "stdio_impl.h"
 
 static void dummy_0()
 {
@@ -60,6 +61,16 @@ int __uniclone(void *, int (*)(), void *);
 static const size_t dummy = 0;
 weak_alias(dummy, __pthread_tsd_size);
 
+static FILE *const dummy_file = 0;
+weak_alias(dummy_file, __stdin_used);
+weak_alias(dummy_file, __stdout_used);
+weak_alias(dummy_file, __stderr_used);
+
+static void init_file_lock(FILE *f)
+{
+       if (f && f->lock<0) f->lock = 0;
+}
+
 int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(void *), void *arg)
 {
        int ret;
@@ -70,6 +81,11 @@ int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(vo
 
        if (!self) return ENOSYS;
        if (!libc.threaded) {
+               for (FILE *f=libc.ofl_head; f; f=f->next)
+                       init_file_lock(f);
+               init_file_lock(__stdin_used);
+               init_file_lock(__stdout_used);
+               init_file_lock(__stderr_used);
                __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK, SIGPT_SET, 0, 8);
                libc.threaded = 1;
        }