libpthread-416.11.1.tar.gz

[apple/libpthread.git] / src / pthread_rwlock.c

diff --git a/src/pthread_rwlock.c b/src/pthread_rwlock.c
index 5b0bc9a70916ccf5a155683294dcbed23f0fd301..dac212ab4743d72df90348b75fce1c2098345646 100644 (file)
--- a/src/pthread_rwlock.c
+++ b/src/pthread_rwlock.c
@@ -199,7 +199,16 @@ rwlock_seq_atomic_load_relaxed(rwlock_seq *seqaddr, rwlock_seq *oldseqval,
        switch (seqfields) {
        case RWLOCK_SEQ_LSU:
 #if RWLOCK_USE_INT128
+#if defined(__arm64__) && defined(__ARM_ARCH_8_2__)
+               // Workaround clang armv81 codegen bug for 128bit os_atomic_load
+               // rdar://problem/31213932
+               oldseqval->seq_LSU = seqaddr->seq_LSU;
+               while (!os_atomic_cmpxchgvw(&seqaddr->atomic_seq_LSU,
+                               oldseqval->seq_LSU, oldseqval->seq_LSU, &oldseqval->seq_LSU,
+                               relaxed));
+#else
                oldseqval->seq_LSU = os_atomic_load(&seqaddr->atomic_seq_LSU, relaxed);
+#endif
 #else
                oldseqval->seq_LS = os_atomic_load(&seqaddr->atomic_seq_LS, relaxed);
                oldseqval->seq_U = os_atomic_load(&seqaddr->atomic_seq_U, relaxed);
@@ -673,8 +682,7 @@ _pthread_rwlock_lock_wait(pthread_rwlock_t *orwlock, bool readlock,
                PLOCKSTAT_RW_BLOCKED(orwlock, plockstat, BLOCK_SUCCESS_PLOCKSTAT);
        } else {
                PLOCKSTAT_RW_BLOCKED(orwlock, plockstat, BLOCK_FAIL_PLOCKSTAT);
-               PTHREAD_ABORT("kernel rwlock returned unknown error %x: "
-                               "tid %llx\n", res, _pthread_selfid_direct());
+               PTHREAD_INTERNAL_CRASH(res, "kernel rwlock returned unknown error");
        }
 
        return res;
@@ -930,8 +938,7 @@ _pthread_rwlock_unlock_drop(pthread_rwlock_t *orwlock, rwlock_seq oldseq,
        } while (res == EINTR);
 
        if (res != 0) {
-               PTHREAD_ABORT("kernel rwunlock returned unknown error %x: "
-                               "tid %llx\n", res, _pthread_selfid_direct());
+               PTHREAD_INTERNAL_CRASH(res, "kernel rwunlock returned unknown error");
        }
 
        return res;