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-rw-r--r--src/thread/__wait.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/src/thread/__wait.c b/src/thread/__wait.c
new file mode 100644
index 00000000..8c249cd3
--- /dev/null
+++ b/src/thread/__wait.c
@@ -0,0 +1,16 @@
+#define SYSCALL_RETURN_ERRNO
+#include "pthread_impl.h"
+
+void __wait(volatile int *addr, volatile int *waiters, int val, int priv)
+{
+ int spins=50000;
+ if (priv) priv = 128; priv=0;
+ while (spins--) {
+ if (*addr==val) a_spin();
+ else return;
+ }
+ if (waiters) a_inc(waiters);
+ while (*addr==val)
+ syscall4(__NR_futex, (long)addr, FUTEX_WAIT|priv, val, 0);
+ if (waiters) a_dec(waiters);
+}