Make empth_wakeup() and empth_terminate() wake up empth_sleep(), and

empth_sleep() return whether that happened:
[EMPTH_LWP] (lwpWakeupSleep): New, factored out of lwpSelect().
[EMPTH_LWP] (lwpSelect): Use it.
[EMPTH_LWP] (lwpWakeup): New.  Call lwpWakeupFd() if sleeping in
lwpSleepFd(), lwpWakeupSleep() if sleeping in lwpSleepUntil().
[EMPTH_LWP] (lwpTerminate, empth_wakeup): Use it rather than
lwpWakeupFd().
[EMPTH_LWP] (lwpWakeupFd): Internal linkage.
[EMPTH_LWP] (lwpSleepUntil): Reset member runtime, so that lwpWakeup()
can test it reliably.  Return how sleep woke up.
[EMPTH_LWP] (empth_sleep): Return value of lwpSleepUntil().
[EMPTH_POSIX] (EMPTH_INTR): New.
[EMPTH_POSIX] (empth_wakeup): Set state to it.
[EMPTH_POSIX] (empth_restorectx): Clear state.
[EMPTH_POSIX] (empth_sleep): Don't re-seleep when state is not clear,
i.e. thread was woken up prematurely.  Return how sleep woke up.
[EMPTH_W32] (empth_sleep): Implement by waiting on hThreadEvent with a
timeout rather than a straight Sleep().  Return how sleep woke up.

include/empthread.h

@@ -181,7 +181,7 @@ void empth_terminate(empth_t *thread);
 void empth_select(int fd, int flags);
 
 /*
- * Awaken THREAD if it is sleeping in empth_select().
+ * Awaken THREAD if it is sleeping in empth_select() or empth_sleep().
  * Note: This must not awaken threads sleeping in other functions.
  * Does not yield the processor.
  */
@@ -189,9 +189,10 @@ void empth_wakeup(empth_t *thread);
 
 /*
  * Put current thread to sleep until the time is UNTIL.
- * May sleep somehwat longer, but never shorter.
+ * Return 0 if it slept until that time.
+ * Return -1 if woken up early, by empth_wakeup().
  */
-void empth_sleep(time_t until);
+int empth_sleep(time_t until);
 
 /*
  * Wait for signal, return the signal number.

include/lwp.h

@@ -47,8 +47,8 @@ void lwpExit(void);
 void lwpTerminate(struct lwpProc * p);
 void lwpYield(void);
 void lwpSleepFd(int fd, int flags);
-void lwpSleepUntil(time_t until);
-void lwpWakeupFd(struct lwpProc * p);
+int lwpSleepUntil(time_t until);
+void lwpWakeup(struct lwpProc *);
 int lwpSigWait(sigset_t *set, int *sig);
 void *lwpGetUD(struct lwpProc * p);
 void lwpSetUD(struct lwpProc * p, char *ud);

src/lib/empthread/lwp.c

@@ -101,13 +101,13 @@ empth_select(int fd, int flags)
 void
 empth_wakeup(empth_t *a)
 {
-    lwpWakeupFd(a);
+    lwpWakeup(a);
 }
 
-void
+int
 empth_sleep(time_t until)
 {
-    lwpSleepUntil(until);
+    return lwpSleepUntil(until);
 }
 
 int

src/lib/empthread/ntthread.c

@@ -599,22 +599,26 @@ empth_wakeup(empth_t *pThread)
  *
  * Put the given thread to sleep...
  */
-void
+int
 empth_sleep(time_t until)
 {
     long lSec;
+    empth_t *pThread = TlsGetValue(dwTLSIndex);
+    int iReturn = 0;
 
+    if ((lSec = until - time(0)) > 0) {
 	loc_BlockThisThread();
-
-    while ((lSec = until - time(0)) > 0) {
 	loc_debug("going to sleep %ld sec", lSec);
-	Sleep(lSec * 1000L);
-    }
+
+	if (WaitForSingleObject(pThread->hThreadEvent, lSec * 1000L) !=
+	    WAIT_TIMEOUT)
+	    iReturn = -1;
 
 	loc_debug("sleep done. Waiting to run.");
-
 	loc_RunThisThread(NULL);
     }
+    return iReturn;
+}
 
 /************************
  * empth_request_shutdown

src/lib/empthread/pthread.c

@@ -58,6 +58,7 @@
 #include "prototypes.h"
 
 #define EMPTH_KILLED  1
+#define EMPTH_INTR 2
 
 struct empth_t {
     char *name;			/* thread name */
@@ -252,6 +253,7 @@ empth_restorectx(void)
 	empth_status("i am dead");
 	empth_exit();
     }
+    ctx_ptr->state = 0;
     empth_status("context restored");
 }
 
@@ -355,33 +357,37 @@ empth_alarm(int sig)
 {
     /*
      * Nothing to do --- we handle this signal just to let
-     * empth_wakeup() interrupt system calls.
+     * empth_wakeup() and empth_terminate() interrupt system calls.
      */
-    empth_status("got alarm signal");
 }
 
 void
 empth_wakeup(empth_t *a)
 {
     empth_status("waking up thread %s", a->name);
+    if (a->state == 0)
+	a->state = EMPTH_INTR;
     pthread_kill(a->id, SIGALRM);
 }
 
-void
+int
 empth_sleep(time_t until)
 {
+    empth_t *ctx = pthread_getspecific(ctx_key);
     struct timeval tv;
+    int res;
 
     empth_status("going to sleep %ld sec", until - time(0));
     pthread_mutex_unlock(&mtx_ctxsw);
+    do {
 	tv.tv_sec = until - time(NULL);
 	tv.tv_usec = 0;
-    do {
-	select(0, NULL, NULL, NULL, &tv);
-    } while ((tv.tv_sec = until - time(NULL)) > 0);
+	res = select(0, NULL, NULL, NULL, &tv);
+    } while (res < 0 && ctx->state == 0);
     empth_status("sleep done. Waiting for lock");
     pthread_mutex_lock(&mtx_ctxsw);
     empth_restorectx();
+    return res;
 }
 
 int

src/lib/lwp/lwp.c

@@ -29,7 +29,7 @@
  *  lwp.c: lightweight process creation, destruction and manipulation
  * 
  *  Known contributors to this file:
- *     Markus Armbruster, 2004-2006
+ *     Markus Armbruster, 2004-2007
  */
 
 #include <config.h>
@@ -145,7 +145,7 @@ lwpCreate(int priority, void (*entry)(void *), int stacksz,
     newp->argv = argv;
     newp->ud = ud;
     newp->dead = 0;
-    newp->runtime = -1;
+    newp->runtime = (time_t)-1;
     newp->fd = -1;
     if (LWP_MAX_PRIO <= priority)
 	priority = LWP_MAX_PRIO - 1;
@@ -166,7 +166,7 @@ lwpCreate(int priority, void (*entry)(void *), int stacksz,
     return newp;
 }
 
-void
+static void
 lwpDestroy(struct lwpProc *proc)
 {
     if (proc->flags & LWP_STACKCHECK) {
@@ -244,8 +244,7 @@ lwpTerminate(struct lwpProc *p)
 {
     lwpStatus(p, "terminating process");
     p->dead = 1;
-    if (p->fd >= 0)
-	lwpWakeupFd(p);
+    lwpWakeup(p);
 }
 
 /*

src/lib/lwp/sel.c

@@ -30,6 +30,7 @@
  * 
  *  Known contributors to this file:
  *     Dave Pare, 1994
+ *     Markus Armbruster, 2007
  */
 
 #include <config.h>
@@ -107,7 +108,7 @@ lwpSleepFd(int fd, int mask)
     lwpReschedule();
 }
 
-void
+static void
 lwpWakeupFd(struct lwpProc *proc)
 {
     if (proc->fd < 0)
@@ -122,9 +123,44 @@ lwpWakeupFd(struct lwpProc *proc)
     lwpReady(proc);
 }
 
+static void
+lwpWakeupSleep(void)
+{
+    time_t now;
+    struct lwpQueue save;
+    struct lwpProc *proc;
+
+    if (LwpDelayq.head) {
+	now = time(NULL);
+	save.tail = save.head = 0;
+	while (NULL != (proc = lwpGetFirst(&LwpDelayq))) {
+	    if (now >= proc->runtime) {
+		lwpStatus(proc, "sleep done");
+		lwpReady(proc);
+	    } else {
+		lwpAddTail(&save, proc);
+	    }
+	}
+	LwpDelayq = save;
+    }
+}
+
 void
+lwpWakeup(struct lwpProc *proc)
+{
+    if (proc->fd >= 0)
+	lwpWakeupFd(proc);
+    else if (proc->runtime != (time_t)-1) {
+	proc->runtime = 0;
+	lwpWakeupSleep();
+    }
+}
+
+int
 lwpSleepUntil(time_t until)
 {
+    int res;
+
     lwpStatus(LwpCurrent, "sleeping for %ld sec",
 	      (long)(until - time(NULL)));
     LwpCurrent->runtime = until;
@@ -134,6 +170,9 @@ lwpSleepUntil(time_t until)
     }
     lwpAddTail(&LwpDelayq, LwpCurrent);
     lwpReschedule();
+    res = LwpCurrent->runtime ? 0 : -1;
+    LwpCurrent->runtime = (time_t)-1;
+    return res;
 }
 
 /*ARGSUSED*/
@@ -149,7 +188,6 @@ lwpSelect(void *arg)
     time_t delta;
     struct lwpProc *proc;
     struct timeval tv;
-    struct lwpQueue save;
 
     lwpStatus(us, "starting select loop");
     FD_ZERO(&readmask);
@@ -194,20 +232,7 @@ lwpSelect(void *arg)
 	    continue;
 	}
 
-	if (LwpDelayq.head) {
-	    /* sleeping proecss activity */
-	    time(&now);
-	    save.tail = save.head = 0;
-	    while (NULL != (proc = lwpGetFirst(&LwpDelayq))) {
-		if (now >= proc->runtime) {
-		    lwpStatus(proc, "sleep done");
-		    lwpReady(proc);
-		} else {
-		    lwpAddTail(&save, proc);
-		}
-	    }
-	    LwpDelayq = save;
-	}
+	lwpWakeupSleep();
 	if (n > 0) {
 	    /* file descriptor activity */
 	    for (fd = 0; fd <= LwpMaxfd; fd++) {