venus: fix the RHEL8 build by using syscall for gettid

src/virtio/vulkan/vn_common.c: In function ‘vn_ring_monitor_acquire’:
src/virtio/vulkan/vn_common.c:129:16: error: implicit declaration of function ‘gettid’; did you mean ‘getgid’? [-Werror=implicit-function-declaration]
  129 |    pid_t tid = gettid();

Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>
Reviewed-by: Ryan Neph <ryanneph@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22489>

diff --git a/src/virtio/vulkan/vn_common.c b/src/virtio/vulkan/vn_common.c
index da74c58..9e8b789 100644 (file)
--- a/src/virtio/vulkan/vn_common.c
+++ b/src/virtio/vulkan/vn_common.c
@@ -11,6 +11,7 @@
 #include "vn_common.h"
 
 #include <stdarg.h>
+#include <sys/syscall.h>
 
 #include "util/log.h"
 #include "util/os_misc.h"
@@ -126,7 +127,7 @@ vn_extension_get_spec_version(const char *name)
 static bool
 vn_ring_monitor_acquire(struct vn_ring *ring)
 {
-   pid_t tid = gettid();
+   pid_t tid = syscall(SYS_gettid);
    if (!ring->monitor.threadid && tid != ring->monitor.threadid &&
        mtx_trylock(&ring->monitor.mutex) == thrd_success) {
       /* register as the only waiting thread that monitors the ring. */
@@ -138,7 +139,7 @@ vn_ring_monitor_acquire(struct vn_ring *ring)
 void
 vn_ring_monitor_release(struct vn_ring *ring)
 {
-   if (gettid() != ring->monitor.threadid)
+   if (syscall(SYS_gettid) != ring->monitor.threadid)
       return;
 
    ring->monitor.threadid = 0;