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gcc/libjava/win32-threads.cc
Ranjit Mathew 65b8e87409 re PR java/9254 (java::lang::Object::wait(), threads-win32.cc returns wrong return codes)
2003-01-28  Ranjit Mathew  <rmathew@hotmail.com>

	Fixes PR java/9254:
	* include/win32-threads.h (_Jv_Mutex_t): Convert to a struct
	additionally containing id of the owner thread as well as
	the number of nested times the thread has acquired the mutex.
	(_Jv_MutexInit): Initialise owner thread id and refcount to 0.
	(_Jv_MutexDestroy): Reset owner thread id and refcount to 0.
	(_Jv_MutexUnlock): Check if really the owner thread, reset
	owner thread id to 0 before leaving, if leaving for the last
	time.
	(_Jv_MutexLock): Set owner thread id in the mutex and increment
	refcount.
	(_Jv_ThreadYield): Yield using a call to Sleep(0).
	* win32-threads.cc (_Jv_CondWait): Check if really owner of
	the passed mutex.
	Pass handle of the broadcast event, instead of a pointer to it
	in Win32 ResetEvent( ) call.
	Remove incorrect return values.
	(_Jv_CondDestroy): Close both event handles and delete
	critical section.
	(_Jv_CondNotify): Check if really the owner thread.
	(_Jv_CondNotifyAll): Check if really the owner thread.
	(_Jv_InitThreads): Change daemon_cond to a manual-reset event.
	(really_start): Use SetEvent( ) to signal daemon_cond.
	(_Jv_ThreadWait): Remove SignalObjectAndWait( ) and use
	WaitForSingleObject( ) instead to wait for daemon_cond to be
	signalled.

From-SVN: r62033
2003-01-28 22:23:36 +00:00

335 lines
7.4 KiB
C++

// win32-threads.cc - interface between libjava and Win32 threads.
/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Free Software
Foundation, Inc.
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
#include <config.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
extern "C"
{
#include <gc.h>
// <windows.h> #define's STRICT, which conflicts with Modifier.h
#undef STRICT
};
#endif /* HAVE_BOEHM_GC */
#include <gcj/cni.h>
#include <jvm.h>
#include <java/lang/Thread.h>
#include <java/lang/System.h>
#include <errno.h>
#ifndef ETIMEDOUT
#define ETIMEDOUT 116
#endif
// This is used to implement thread startup.
struct starter
{
_Jv_ThreadStartFunc *method;
_Jv_Thread_t *data;
};
// Controls access to the variable below
static HANDLE daemon_mutex;
static HANDLE daemon_cond;
// Number of non-daemon threads - _Jv_ThreadWait returns when this is 0
static int non_daemon_count;
// TLS key get Java object representing the thread
DWORD _Jv_ThreadKey;
// TLS key to get _Jv_Thread_t* representing the thread
DWORD _Jv_ThreadDataKey;
//
// These are the flags that can appear in _Jv_Thread_t.
//
// Thread started.
#define FLAG_START 0x01
// Thread is daemon.
#define FLAG_DAEMON 0x02
//
// Condition variables.
//
// we do lazy creation of Events since CreateEvent() is insanely
// expensive, and because the rest of libgcj will call _Jv_CondInit
// when only a mutex is needed.
inline void
ensure_condvar_initialized(_Jv_ConditionVariable_t *cv)
{
if (cv->ev[0] == 0)
{
cv->ev[0] = CreateEvent (NULL, 0, 0, NULL);
if (cv->ev[0] == 0) JvFail("CreateEvent() failed");
cv->ev[1] = CreateEvent (NULL, 1, 0, NULL);
if (cv->ev[1] == 0) JvFail("CreateEvent() failed");
}
}
// Reimplementation of the general algorithm described at
// http://www.cs.wustl.edu/~schmidt/win32-cv-1.html (isomorphic to
// 3.2, not a cut-and-paste).
int
_Jv_CondWait(_Jv_ConditionVariable_t *cv, _Jv_Mutex_t *mu, jlong millis, jint nanos)
{
if (mu->owner != GetCurrentThreadId ( ))
return _JV_NOT_OWNER;
EnterCriticalSection (&cv->count_mutex);
ensure_condvar_initialized (cv);
cv->blocked_count++;
LeaveCriticalSection (&cv->count_mutex);
DWORD time;
if ((millis == 0) && (nanos > 0)) time = 1;
else if (millis == 0) time = INFINITE;
else time = millis;
_Jv_MutexUnlock (mu);
DWORD rval = WaitForMultipleObjects (2, &(cv->ev[0]), 0, time);
EnterCriticalSection(&cv->count_mutex);
cv->blocked_count--;
// If we were unblocked by the second event (the broadcast one)
// and nobody is left, then reset the event.
int last_waiter = (rval == (WAIT_OBJECT_0 + 1)) && (cv->blocked_count == 0);
LeaveCriticalSection(&cv->count_mutex);
if (last_waiter)
ResetEvent (cv->ev[1]);
_Jv_MutexLock (mu);
return 0;
}
void
_Jv_CondInit (_Jv_ConditionVariable_t *cv)
{
// we do lazy creation of Events since CreateEvent() is insanely expensive
cv->ev[0] = 0;
InitializeCriticalSection (&cv->count_mutex);
cv->blocked_count = 0;
}
void
_Jv_CondDestroy (_Jv_ConditionVariable_t *cv)
{
if (cv->ev[0] != 0)
{
CloseHandle (cv->ev[0]);
CloseHandle (cv->ev[1]);
cv->ev[0] = 0;
}
DeleteCriticalSection (&cv->count_mutex);
}
int
_Jv_CondNotify (_Jv_ConditionVariable_t *cv, _Jv_Mutex_t *mu)
{
if (mu->owner != GetCurrentThreadId ( ))
return _JV_NOT_OWNER;
EnterCriticalSection (&cv->count_mutex);
ensure_condvar_initialized (cv);
int somebody_is_blocked = cv->blocked_count > 0;
LeaveCriticalSection (&cv->count_mutex);
if (somebody_is_blocked)
SetEvent (cv->ev[0]);
return 0;
}
int
_Jv_CondNotifyAll (_Jv_ConditionVariable_t *cv, _Jv_Mutex_t *mu)
{
if (mu->owner != GetCurrentThreadId ( ))
return _JV_NOT_OWNER;
EnterCriticalSection (&cv->count_mutex);
ensure_condvar_initialized (cv);
int somebody_is_blocked = cv->blocked_count > 0;
LeaveCriticalSection (&cv->count_mutex);
if (somebody_is_blocked)
SetEvent (cv->ev[1]);
return 0;
}
//
// Threads.
//
void
_Jv_InitThreads (void)
{
_Jv_ThreadKey = TlsAlloc();
_Jv_ThreadDataKey = TlsAlloc();
daemon_mutex = CreateMutex (NULL, 0, NULL);
daemon_cond = CreateEvent (NULL, 1, 0, NULL);
non_daemon_count = 0;
}
_Jv_Thread_t *
_Jv_ThreadInitData (java::lang::Thread* obj)
{
_Jv_Thread_t *data = (_Jv_Thread_t*)_Jv_Malloc(sizeof(_Jv_Thread_t));
data->flags = 0;
data->thread_obj = obj;
return data;
}
void
_Jv_ThreadDestroyData (_Jv_Thread_t *data)
{
_Jv_Free(data);
}
void
_Jv_ThreadSetPriority (_Jv_Thread_t *data, jint prio)
{
int actual = THREAD_PRIORITY_NORMAL;
if (data->flags & FLAG_START)
{
switch (prio)
{
case 10:
actual = THREAD_PRIORITY_TIME_CRITICAL;
break;
case 9:
actual = THREAD_PRIORITY_HIGHEST;
break;
case 8:
case 7:
actual = THREAD_PRIORITY_ABOVE_NORMAL;
break;
case 6:
case 5:
actual = THREAD_PRIORITY_NORMAL;
break;
case 4:
case 3:
actual = THREAD_PRIORITY_BELOW_NORMAL;
break;
case 2:
actual = THREAD_PRIORITY_LOWEST;
break;
case 1:
actual = THREAD_PRIORITY_IDLE;
break;
}
SetThreadPriority(data->handle, actual);
}
}
void
_Jv_ThreadRegister (_Jv_Thread_t *data)
{
TlsSetValue (_Jv_ThreadKey, data->thread_obj);
TlsSetValue (_Jv_ThreadDataKey, data);
}
void
_Jv_ThreadUnRegister ()
{
TlsSetValue (_Jv_ThreadKey, NULL);
TlsSetValue (_Jv_ThreadDataKey, NULL);
}
// This function is called when a thread is started. We don't arrange
// to call the `run' method directly, because this function must
// return a value.
static DWORD WINAPI
really_start (void* x)
{
struct starter *info = (struct starter *) x;
_Jv_ThreadRegister (info->data);
info->method (info->data->thread_obj);
if (! (info->data->flags & FLAG_DAEMON))
{
WaitForSingleObject (daemon_mutex, INFINITE);
non_daemon_count--;
if (! non_daemon_count)
SetEvent (daemon_cond);
ReleaseMutex (daemon_mutex);
}
return 0;
}
void
_Jv_ThreadStart (java::lang::Thread *thread, _Jv_Thread_t *data, _Jv_ThreadStartFunc *meth)
{
DWORD id;
struct starter *info;
// Do nothing if thread has already started
if (data->flags & FLAG_START)
return;
data->flags |= FLAG_START;
// FIXME: handle marking the info object for GC.
info = (struct starter *) _Jv_AllocBytes (sizeof (struct starter));
info->method = meth;
info->data = data;
if (! thread->isDaemon ())
{
WaitForSingleObject (daemon_mutex, INFINITE);
non_daemon_count++;
ReleaseMutex (daemon_mutex);
}
else
data->flags |= FLAG_DAEMON;
HANDLE h = GC_CreateThread(NULL, 0, really_start, info, 0, &id);
_Jv_ThreadSetPriority(data, thread->getPriority());
//if (!h)
//JvThrow ();
}
void
_Jv_ThreadWait (void)
{
WaitForSingleObject (daemon_mutex, INFINITE);
if (non_daemon_count)
{
ReleaseMutex (daemon_mutex);
WaitForSingleObject (daemon_cond, INFINITE);
}
}
void
_Jv_ThreadInterrupt (_Jv_Thread_t *data)
{
MessageBox(NULL, "Unimplemented", "win32-threads.cc:_Jv_ThreadInterrupt", MB_OK);
// FIXME:
}