implement PT_GNU_RELRO support

[musl] / src / thread / synccall.c

diff --git a/src/thread/synccall.c b/src/thread/synccall.c
index fd377cb..a21578d 100644 (file)
--- a/src/thread/synccall.c
+++ b/src/thread/synccall.c
@@ -9,7 +9,6 @@ static struct chain {
 static void (*callback)(void *), *context;
 static int chainlen;
 static sem_t chainlock, chaindone;
-static pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER;
 
 static void handler(int sig, siginfo_t *si, void *ctx)
 {
@@ -21,15 +20,6 @@ static void handler(int sig, siginfo_t *si, void *ctx)
 
        sigqueue(self->pid, SIGSYNCCALL, (union sigval){0});
 
-       /* Threads which have already decremented themselves from the
-        * thread count must not act. Block further receipt of signals
-        * and return. */
-       if (self->dead) {
-               memset(&((ucontext_t *)ctx)->uc_sigmask, -1, 8);
-               errno = old_errno;
-               return;
-       }
-
        sem_init(&ch.sem, 0, 0);
        sem_init(&ch.sem2, 0, 0);
 
@@ -52,21 +42,21 @@ void __synccall(void (*func)(void *), void *ctx)
        pthread_t self;
        struct sigaction sa;
        struct chain *next;
-       uint64_t oldmask;
+       sigset_t oldmask;
 
        if (!libc.threads_minus_1) {
                func(ctx);
                return;
        }
 
-       pthread_rwlock_wrlock(&lock);
+       __inhibit_ptc();
 
-       __syscall(SYS_rt_sigprocmask, SIG_BLOCK, SIGALL_SET,
-               &oldmask, __SYSCALL_SSLEN);
+       __block_all_sigs(&oldmask);
 
        sem_init(&chaindone, 0, 0);
        sem_init(&chainlock, 0, 1);
        chainlen = 0;
+       head = 0;
        callback = func;
        context = ctx;
 
@@ -79,6 +69,10 @@ void __synccall(void (*func)(void *), void *ctx)
        sigqueue(self->pid, SIGSYNCCALL, (union sigval){0});
        while (sem_wait(&chaindone));
 
+       sa.sa_flags = 0;
+       sa.sa_handler = SIG_IGN;
+       __libc_sigaction(SIGSYNCCALL, &sa, 0);
+
        for (cur=head; cur; cur=cur->next) {
                sem_post(&cur->sem);
                while (sem_wait(&cur->sem2));
@@ -90,22 +84,7 @@ void __synccall(void (*func)(void *), void *ctx)
                sem_post(&cur->sem);
        }
 
-       sa.sa_flags = 0;
-       sa.sa_handler = SIG_IGN;
-       __libc_sigaction(SIGSYNCCALL, &sa, 0);
-
-       __syscall(SYS_rt_sigprocmask, SIG_SETMASK,
-               &oldmask, 0, __SYSCALL_SSLEN);
-
-       pthread_rwlock_unlock(&lock);
-}
+       __restore_sigs(&oldmask);
 
-void __synccall_lock()
-{
-       pthread_rwlock_rdlock(&lock);
-}
-
-void __synccall_unlock()
-{
-       pthread_rwlock_unlock(&lock);
+       __release_ptc();
 }