/* -----------------------------------------------------------------------------
- * $Id: Select.c,v 1.23 2003/01/25 15:54:50 wolfgang Exp $
+ * $Id: Select.c,v 1.30 2003/10/01 10:49:09 wolfgang Exp $
*
* (c) The GHC Team 1995-2002
*
*
* ---------------------------------------------------------------------------*/
+
/* we're outside the realms of POSIX here... */
/* #include "PosixSource.h" */
#include "Schedule.h"
#include "RtsUtils.h"
#include "RtsFlags.h"
+#include "Timer.h"
#include "Itimer.h"
#include "Signals.h"
#include "Capability.h"
# include <sys/time.h>
# endif
-# ifdef mingw32_TARGET_OS
-# include <windows.h>
-# endif
-
#include <errno.h>
#include <string.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
/* last timestamp */
nat timestamp = 0;
#ifdef RTS_SUPPORTS_THREADS
static rtsBool isWorkerBlockedInAwaitEvent = rtsFalse;
static rtsBool workerWakeupPending = rtsFalse;
-#ifndef mingw32_TARGET_OS
static int workerWakeupPipe[2];
static rtsBool workerWakeupInited = rtsFalse;
#endif
-#endif
/* There's a clever trick here to avoid problems when the time wraps
* around. Since our maximum delay is smaller than 31 bits of ticks
StgTSO *tso, *prev, *next;
rtsBool ready;
fd_set rfd,wfd;
-#ifndef mingw32_TARGET_OS
int numFound;
int maxfd = -1;
-#endif
rtsBool select_succeeded = rtsTrue;
rtsBool unblock_all = rtsFalse;
struct timeval tv;
min = 0x7ffffff;
}
-#ifndef mingw32_TARGET_OS
/*
* Collect all of the fd's that we're interested in
*/
barf("select failed");
}
}
-#else /* on mingwin */
-#ifdef RTS_SUPPORTS_THREADS
- isWorkerBlockedInAwaitEvent = rtsTrue;
-#endif
- RELEASE_LOCK(&sched_mutex);
- while (1) {
- Sleep(0); /* don't busy wait */
-#endif /* mingw32_TARGET_OS */
ACQUIRE_LOCK(&sched_mutex);
#ifdef RTS_SUPPORTS_THREADS
isWorkerBlockedInAwaitEvent = rtsFalse;
#endif
-#ifndef mingw32_TARGET_OS
/* We got a signal; could be one of ours. If so, we need
* to start up the signal handler straight away, otherwise
* we could block for a long time before the signal is
* serviced.
*/
+#if defined(RTS_USER_SIGNALS)
if (signals_pending()) {
RELEASE_LOCK(&sched_mutex); /* ToDo: kill */
startSignalHandlers();
}
}
-#if defined(RTS_SUPPORTS_THREADS) && !defined(mingw32_TARGET_OS)
+#if defined(RTS_SUPPORTS_THREADS)
// if we were woken up by wakeBlockedWorkerThread,
// read the dummy byte from the pipe
if(select_succeeded && FD_ISSET(workerWakeupPipe[0], &rfd)) {
* wake it.
* Must be called with sched_mutex held.
*/
-
void
wakeBlockedWorkerThread()
{
-#ifndef mingw32_TARGET_OS
if(isWorkerBlockedInAwaitEvent && !workerWakeupPending) {
unsigned char dummy = 42; // Any value will do here
write(workerWakeupPipe[1],&dummy,1);
workerWakeupPending = rtsTrue;
}
-#else
- // The Win32 implementation currently uses a polling loop,
- // so there is no need to explicitly wake it
-#endif
}
+/* resetWorkerWakeupPipeAfterFork
+ *
+ * To be called right after a fork().
+ * After the fork(), the worker wakeup pipe will be shared
+ * with the parent process, and that's something we don't want.
+ */
+void
+resetWorkerWakeupPipeAfterFork()
+{
+ if(workerWakeupInited) {
+ close(workerWakeupPipe[0]);
+ close(workerWakeupPipe[1]);
+ }
+ workerWakeupInited = rtsFalse;
+}
#endif