Ticket #174: spinlock_yield.diff

x86_spinlocks.h

@@ -25 +25 @@
    $Id: x86_spinlocks.h 178 2006-03-06 09:08:40Z bart $
 */
 
+#ifdef HAVE_SCHED_H
+#  include <sched.h>
+#endif
+
 typedef struct { volatile unsigned int lock;
                  volatile pid_t pid;
                  volatile int locked;
@@ -35 +39 @@
 #define spinlock_try_lock(rw)  asm volatile("lock ; decl %0" :"=m" ((rw)->lock) : : "memory")
 #define _spinlock_unlock(rw)   asm volatile("lock ; incl %0" :"=m" ((rw)->lock) : : "memory")
 
+
+#ifdef HAVE_SCHED_YIELD
+#  define yield sched_yield
+#else
 static inline void yield()
 {
   struct timeval t;
@@ -43 +51 @@
   t.tv_usec = 100;
   select(0, NULL, NULL, NULL, &t);
 }
+#endif
 
 static inline void spinlock_unlock(spinlock_t* rw) {
   if (rw->locked && (rw->pid == getpid())) {