runtime: fix prototype for openbsd thrsleep

- Fix function prototype for thrsleep().
- Provide enums for clock identifiers.
- Provide timespec structure for use with thrsleep().

R=golang-dev, dave, rsc
CC=golang-dev
https://golang.org/cl/5360042

src/pkg/runtime/openbsd/386/defs.h

@@ -97,6 +97,12 @@ struct StackT {
 	int32 ss_flags;
 };
 
+typedef struct Timespec Timespec;
+struct Timespec {
+	int32 tv_sec;
+	int32 tv_nsec;
+};
+
 typedef struct Timeval Timeval;
 struct Timeval {
 	int32 tv_sec;

src/pkg/runtime/openbsd/amd64/defs.h

@@ -100,6 +100,13 @@ struct StackT {
 	byte pad_godefs_0[4];
 };
 
+typedef struct Timespec Timespec;
+struct Timespec {
+	int32 tv_sec;
+	byte pad_godefs_0[4];
+	int64 tv_nsec;
+};
+
 typedef struct Timeval Timeval;
 struct Timeval {
 	int64 tv_sec;

src/pkg/runtime/openbsd/defs.c

@@ -93,6 +93,7 @@ typedef union sigval $Sigval;
 
 typedef stack_t $StackT;
 
+typedef struct timespec $Timespec;
 typedef struct timeval $Timeval;
 typedef struct itimerval $Itimerval;
 

src/pkg/runtime/openbsd/thread.c

@@ -18,13 +18,19 @@ enum
 
 	ESRCH = 3,
 	ENOTSUP = 91,
+
+	// From OpenBSD's sys/time.h
+	CLOCK_REALTIME = 0,
+	CLOCK_VIRTUAL = 1,
+	CLOCK_PROF = 2,
+	CLOCK_MONOTONIC = 3
 };
 
 extern SigTab runtime·sigtab[];
 
 extern int64 runtime·rfork_thread(int32 flags, void *stack, M *m, G *g, void (*fn)(void));
-extern int32 runtime·thrsleep(void *, void *, void*, void *);
-extern int32 runtime·thrwakeup(void *, int32);
+extern int32 runtime·thrsleep(void *ident, int32 clock_id, void *tsp, void *lock);
+extern int32 runtime·thrwakeup(void *ident, int32 n);
 
 // From OpenBSD's <sys/sysctl.h>
 #define	CTL_HW	6
@@ -65,7 +71,7 @@ retry:
 		runtime·osyield();
 	if(m->waitsemacount == 0) {
 		// the function unlocks the spinlock
-		runtime·thrsleep(&m->waitsemacount, 0, 0, &m->waitsemalock);
+		runtime·thrsleep(&m->waitsemacount, 0, nil, &m->waitsemalock);
 		goto retry;
 	}
 	m->waitsemacount--;