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[v2,2/2] Use _umtx_op for futex on FreeBSD

Message ID 20200127200830.29347-2-alex_y_xu@yahoo.ca
State Superseded, archived
Headers show
Series [v2,1/2] Add FreeBSD, DragonFly to syscall-compat.h | expand

Commit Message

Alex Xu (Hello71 Jan. 27, 2020, 8:08 p.m. UTC
---
 include/urcu/futex.h | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
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Patch

diff --git a/include/urcu/futex.h b/include/urcu/futex.h
index c206c6f..5a95d00 100644
--- a/include/urcu/futex.h
+++ b/include/urcu/futex.h
@@ -24,6 +24,7 @@ 
  */
 
 #include <urcu/config.h>
+#include <errno.h>
 #include <stdint.h>
 #include <time.h>
 
@@ -103,6 +104,49 @@  static inline int futex_async(int32_t *uaddr, int op, int32_t val,
 	return ret;
 }
 
+#elif defined(__FreeBSD__)
+
+#include <sys/umtx.h>
+
+static inline int futex_async(int32_t *uaddr, int op, int32_t val,
+		const struct timespec *timeout, int32_t *uaddr2, int32_t val3)
+{
+	int umtx_op;
+	void *umtx_uaddr = NULL, *umtx_uaddr2 = NULL;
+	struct _umtx_time umtx_timeout = {
+		._flags = UMTX_ABSTIME,
+		._clockid = CLOCK_MONOTONIC
+	};
+
+	switch (op) {
+		case FUTEX_WAIT:
+			// on FreeBSD, a "u_int" is a 32-bit integer
+			umtx_op = UMTX_OP_WAIT_UINT;
+			if (timeout != NULL) {
+				umtx_timeout._timeout = *timeout;
+				umtx_uaddr = (void *)sizeof(umtx_timeout);
+				umtx_uaddr2 = (void *)&umtx_timeout;
+			}
+			break;
+
+		case FUTEX_WAKE:
+			umtx_op = UMTX_OP_WAKE;
+			break;
+
+		default:
+			errno = EINVAL;
+			return -1;
+	}
+
+	return _umtx_op(uaddr, umtx_op, val, umtx_uaddr, umtx_uaddr2);
+}
+
+static inline int futex_noasync(int32_t *uaddr, int op, int32_t val,
+		const struct timespec *timeout, int32_t *uaddr2, int32_t val3)
+{
+	return futex_async(uaddr, op, val, timeout, uaddr2, val3);
+}
+
 #elif defined(__CYGWIN__)
 
 /*