// posix-threads.cc - interface between libjava and POSIX threads.
-/* Copyright (C) 1998, 1999, 2000, 2001, 2004 Free Software Foundation
+/* Copyright (C) 1998, 1999, 2000, 2001, 2004, 2006 Free Software Foundation
This file is part of libgcj.
#include <config.h>
+#include "posix.h"
+
// If we're using the Boehm GC, then we need to override some of the
// thread primitives. This is fairly gross.
#ifdef HAVE_BOEHM_GC
\f
+int
+_Jv_MutexLock (_Jv_Mutex_t *mu)
+{
+ pthread_t self = pthread_self ();
+ if (mu->owner == self)
+ {
+ mu->count++;
+ }
+ else
+ {
+ JvSetThreadState holder (_Jv_ThreadCurrent(), JV_BLOCKED);
+
+# ifdef LOCK_DEBUG
+ int result = pthread_mutex_lock (&mu->mutex);
+ if (0 != result)
+ {
+ fprintf(stderr, "Pthread_mutex_lock returned %d\n", result);
+ for (;;) {}
+ }
+# else
+ pthread_mutex_lock (&mu->mutex);
+# endif
+ mu->count = 1;
+ mu->owner = self;
+ }
+ return 0;
+}
+
// Wait for the condition variable "CV" to be notified.
// Return values:
// 0: the condition was notified, or the timeout expired.
struct timespec ts;
+ JvThreadState new_state = JV_WAITING;
if (millis > 0 || nanos > 0)
{
// Calculate the abstime corresponding to the timeout.
- // Everything is in milliseconds.
- //
- // We use `unsigned long long' rather than jlong because our
- // caller may pass up to Long.MAX_VALUE millis. This would
- // overflow the range of a jlong when added to the current time.
-
- unsigned long long startTime
- = (unsigned long long)java::lang::System::currentTimeMillis();
- unsigned long long m = (unsigned long long)millis + startTime;
- unsigned long long seconds = m / 1000;
+ unsigned long long seconds;
+ unsigned long usec;
+
+ // For better accuracy, should use pthread_condattr_setclock
+ // and clock_gettime.
+#ifdef HAVE_GETTIMEOFDAY
+ timeval tv;
+ gettimeofday (&tv, NULL);
+ usec = tv.tv_usec;
+ seconds = tv.tv_sec;
+#else
+ unsigned long long startTime = java::lang::System::currentTimeMillis();
+ seconds = startTime / 1000;
+ /* Assume we're about half-way through this millisecond. */
+ usec = (startTime % 1000) * 1000 + 500;
+#endif
+ /* These next two statements cannot overflow. */
+ usec += nanos / 1000;
+ usec += (millis % 1000) * 1000;
+ /* These two statements could overflow only if tv.tv_sec was
+ insanely large. */
+ seconds += millis / 1000;
+ seconds += usec / 1000000;
ts.tv_sec = seconds;
if (ts.tv_sec < 0 || (unsigned long long)ts.tv_sec != seconds)
millis = nanos = 0;
}
else
- {
- m %= 1000;
- ts.tv_nsec = m * 1000000 + (unsigned long long)nanos;
- }
+ /* This next statement also cannot overflow. */
+ ts.tv_nsec = (usec % 1000000) * 1000 + (nanos % 1000);
}
_Jv_Thread_t *current = _Jv_ThreadCurrentData ();
return _JV_INTERRUPTED;
}
+ // Set the thread's state.
+ JvSetThreadState holder (current_obj, new_state);
+
// Add this thread to the cv's wait set.
current->next = NULL;
pthread_mutex_unlock (&data->wait_mutex);
}
+/**
+ * Releases the block on a thread created by _Jv_ThreadPark(). This
+ * method can also be used to terminate a blockage caused by a prior
+ * call to park. This operation is unsafe, as the thread must be
+ * guaranteed to be live.
+ *
+ * @param thread the thread to unblock.
+ */
+void
+ParkHelper::unpark ()
+{
+ using namespace ::java::lang;
+ volatile obj_addr_t *ptr = &permit;
+
+ /* If this thread is in state RUNNING, give it a permit and return
+ immediately. */
+ if (compare_and_swap
+ (ptr, Thread::THREAD_PARK_RUNNING, Thread::THREAD_PARK_PERMIT))
+ return;
+
+ /* If this thread is parked, put it into state RUNNING and send it a
+ signal. */
+ if (compare_and_swap
+ (ptr, Thread::THREAD_PARK_PARKED, Thread::THREAD_PARK_RUNNING))
+ {
+ pthread_mutex_lock (&mutex);
+ pthread_cond_signal (&cond);
+ pthread_mutex_unlock (&mutex);
+ }
+}
+
+/**
+ * Sets our state to dead.
+ */
+void
+ParkHelper::deactivate ()
+{
+ permit = ::java::lang::Thread::THREAD_PARK_DEAD;
+}
+
+/**
+ * Blocks the thread until a matching _Jv_ThreadUnpark() occurs, the
+ * thread is interrupted or the optional timeout expires. If an
+ * unpark call has already occurred, this also counts. A timeout
+ * value of zero is defined as no timeout. When isAbsolute is true,
+ * the timeout is in milliseconds relative to the epoch. Otherwise,
+ * the value is the number of nanoseconds which must occur before
+ * timeout. This call may also return spuriously (i.e. for no
+ * apparent reason).
+ *
+ * @param isAbsolute true if the timeout is specified in milliseconds from
+ * the epoch.
+ * @param time either the number of nanoseconds to wait, or a time in
+ * milliseconds from the epoch to wait for.
+ */
+void
+ParkHelper::park (jboolean isAbsolute, jlong time)
+{
+ using namespace ::java::lang;
+ volatile obj_addr_t *ptr = &permit;
+
+ /* If we have a permit, return immediately. */
+ if (compare_and_swap
+ (ptr, Thread::THREAD_PARK_PERMIT, Thread::THREAD_PARK_RUNNING))
+ return;
+
+ struct timespec ts;
+ jlong millis = 0, nanos = 0;
+
+ if (time)
+ {
+ if (isAbsolute)
+ {
+ millis = time;
+ nanos = 0;
+ }
+ else
+ {
+ millis = java::lang::System::currentTimeMillis();
+ nanos = time;
+ }
+
+ if (millis > 0 || nanos > 0)
+ {
+ // Calculate the abstime corresponding to the timeout.
+ // Everything is in milliseconds.
+ //
+ // We use `unsigned long long' rather than jlong because our
+ // caller may pass up to Long.MAX_VALUE millis. This would
+ // overflow the range of a timespec.
+
+ unsigned long long m = (unsigned long long)millis;
+ unsigned long long seconds = m / 1000;
+
+ ts.tv_sec = seconds;
+ if (ts.tv_sec < 0 || (unsigned long long)ts.tv_sec != seconds)
+ {
+ // We treat a timeout that won't fit into a struct timespec
+ // as a wait forever.
+ millis = nanos = 0;
+ }
+ else
+ {
+ m %= 1000;
+ ts.tv_nsec = m * 1000000 + (unsigned long long)nanos;
+ }
+ }
+ }
+
+ if (compare_and_swap
+ (ptr, Thread::THREAD_PARK_RUNNING, Thread::THREAD_PARK_PARKED))
+ {
+ pthread_mutex_lock (&mutex);
+ if (millis == 0 && nanos == 0)
+ pthread_cond_wait (&cond, &mutex);
+ else
+ pthread_cond_timedwait (&cond, &mutex, &ts);
+ pthread_mutex_unlock (&mutex);
+
+ /* If we were unparked by some other thread, this will already
+ be in state THREAD_PARK_RUNNING. If we timed out, we have to
+ do it ourself. */
+ compare_and_swap
+ (ptr, Thread::THREAD_PARK_PARKED, Thread::THREAD_PARK_RUNNING);
+ }
+}
+
static void
handle_intr (int)
{
// Bigger default on 64-bit systems.
min_ss *= 2;
+#ifdef PTHREAD_STACK_MIN
if (min_ss < PTHREAD_STACK_MIN)
min_ss = PTHREAD_STACK_MIN;
+#endif
if (gcj::stack_size > 0 && gcj::stack_size < min_ss)
gcj::stack_size = min_ss;