gcc/libjava/win32-threads.cc

251 lines
5.2 KiB
C++
Raw Normal View History

// win32-threads.cc - interface between libjava and Win32 threads.
/* Copyright (C) 1998, 1999 Red Hat, 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 <boehm-config.h>
#include <gc.h>
};
#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;
java::lang::Thread *object;
_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.
//
int
_Jv_CondWait (_Jv_ConditionVariable_t *cv, _Jv_Mutex_t *mu, jlong millis, jint nanos)
{
DWORD time;
DWORD rval;
Makefile.in: New #defines and friends for Thread.h. * Makefile.in: New #defines and friends for Thread.h. * posix-threads.cc: (struct starter): Remove `object'. (_Jv_CondWait): Use interruptable condition variables and new recursive mutexes. New return codes on interrupt or non-ownership of mutex. (_Jv_CondNotify): Ditto. (_Jv_CondNotifyAll): Ditto. (_Jv_ThreadInterrupt): Set thread interrupt flag directly. Interrupt the target thread by signaling its wait condition. (_Jv_ThreadInitData): Set `thread_obj' in the thread data struct, not the starter struct. Initialize wait_mutex and wait_cond. (_Jv_MutexLock): New recursive mutex implementation. Moved from posix-threads.h. (_Jv_MutexUnlock): Ditto. (really_start): Set info->data->thread from pthread_self() to work around a race condition. Destroy wait_mutex and wait_cond when run() returns. * java/lang/Thread.java: (isInterrupted_): Renamed to overloaded `isInterrupted(boolean)'. Clear interrupted flag if clear_flag is set. startable_flag: New private field. (Thread): Initialize `startable_flag'. (toString): Check for null thread group. * java/lang/natThread.cc: (struct natThread): New fields `join_mutex', `join_cond'. Removed fields `joiner', `next'. (class locker): Removed. (initialize_native): Initialize `join_cond' and `join_mutex'. (interrupt): Now just calls _Jv_ThreadInterrupt(). (join): Simplified. Just wait on the target thread's join condition. (finish_): Remove join list code. Unset thread group. Signal potential joiners by notifying the dying threads join_cond. (start): Check for illegal restarts. * java/lang/natObject.cc: Check for return value of _Jv_CondWait and act appropriatly. * include/posix-threads.h: Remove all HAVE_RECURSIVE_MUTEX related #defines and #ifdefs. (struct _Jv_Thread_t): New fields `thread_obj', `wait_cond', `wait_mutex', `next'. (struct _Jv_ConditionVariable_t): Define as a struct instead of directly mapping to pthread_cond_t. (struct _Jv_Mutex_t): New recursive implementation. (_Jv_PthreadCheckMonitor): Reimplemented. Simple `owner' check. _Jv_HaveCondDestroy: Never define this for posix-threads. (_Jv_CondNotify): Remove inline implementation(s), prototype instead. (_Jv_CondNotifyAll): Ditto. (_Jv_MutexLock): Ditto. (_Jv_MutexUnlock): Ditto. (_Jv_MutexInit): Changed to reflect new mutex implementation. (_Jv_MutexDestroy): Ditto. (_Jv_CondDestroy): Removed. (_Jv_PthreadGetMutex): Removed. * include/win32-threads.h: (_Jv_CondNotify): Guess _JV_NOT_OWNER on an error. Add a FIXME about this. (_Jv_CondNotifyAll): Ditto. * win32-threads.cc: (_Jv_CondWait): Return 0 on a timeout. Guess _JV_NOT_OWNER on other errors. Add FIXME. From-SVN: r32773
2000-03-28 04:22:24 +02:00
// FIXME: check for mutex ownership?
_Jv_MutexUnlock (mu);
if((millis == 0) && (nanos > 0))
time = 1;
else if(millis == 0)
time = INFINITE;
else
time = millis;
rval = WaitForSingleObject (*cv, time);
_Jv_MutexLock (mu);
if (rval == WAIT_FAILED)
Makefile.in: New #defines and friends for Thread.h. * Makefile.in: New #defines and friends for Thread.h. * posix-threads.cc: (struct starter): Remove `object'. (_Jv_CondWait): Use interruptable condition variables and new recursive mutexes. New return codes on interrupt or non-ownership of mutex. (_Jv_CondNotify): Ditto. (_Jv_CondNotifyAll): Ditto. (_Jv_ThreadInterrupt): Set thread interrupt flag directly. Interrupt the target thread by signaling its wait condition. (_Jv_ThreadInitData): Set `thread_obj' in the thread data struct, not the starter struct. Initialize wait_mutex and wait_cond. (_Jv_MutexLock): New recursive mutex implementation. Moved from posix-threads.h. (_Jv_MutexUnlock): Ditto. (really_start): Set info->data->thread from pthread_self() to work around a race condition. Destroy wait_mutex and wait_cond when run() returns. * java/lang/Thread.java: (isInterrupted_): Renamed to overloaded `isInterrupted(boolean)'. Clear interrupted flag if clear_flag is set. startable_flag: New private field. (Thread): Initialize `startable_flag'. (toString): Check for null thread group. * java/lang/natThread.cc: (struct natThread): New fields `join_mutex', `join_cond'. Removed fields `joiner', `next'. (class locker): Removed. (initialize_native): Initialize `join_cond' and `join_mutex'. (interrupt): Now just calls _Jv_ThreadInterrupt(). (join): Simplified. Just wait on the target thread's join condition. (finish_): Remove join list code. Unset thread group. Signal potential joiners by notifying the dying threads join_cond. (start): Check for illegal restarts. * java/lang/natObject.cc: Check for return value of _Jv_CondWait and act appropriatly. * include/posix-threads.h: Remove all HAVE_RECURSIVE_MUTEX related #defines and #ifdefs. (struct _Jv_Thread_t): New fields `thread_obj', `wait_cond', `wait_mutex', `next'. (struct _Jv_ConditionVariable_t): Define as a struct instead of directly mapping to pthread_cond_t. (struct _Jv_Mutex_t): New recursive implementation. (_Jv_PthreadCheckMonitor): Reimplemented. Simple `owner' check. _Jv_HaveCondDestroy: Never define this for posix-threads. (_Jv_CondNotify): Remove inline implementation(s), prototype instead. (_Jv_CondNotifyAll): Ditto. (_Jv_MutexLock): Ditto. (_Jv_MutexUnlock): Ditto. (_Jv_MutexInit): Changed to reflect new mutex implementation. (_Jv_MutexDestroy): Ditto. (_Jv_CondDestroy): Removed. (_Jv_PthreadGetMutex): Removed. * include/win32-threads.h: (_Jv_CondNotify): Guess _JV_NOT_OWNER on an error. Add a FIXME about this. (_Jv_CondNotifyAll): Ditto. * win32-threads.cc: (_Jv_CondWait): Return 0 on a timeout. Guess _JV_NOT_OWNER on other errors. Add FIXME. From-SVN: r32773
2000-03-28 04:22:24 +02:00
return _JV_NOT_OWNER; // FIXME?
else
return 0;
}
//
// Mutexes.
//
int
_Jv_MutexLock (_Jv_Mutex_t *mu)
{
DWORD rval;
// FIXME: Are Win32 mutexs recursive? Should we use critical section objects
rval = WaitForSingleObject (*mu, INFINITE);
if (rval == WAIT_FAILED)
return GetLastError (); // FIXME: Map to errno?
else if (rval == WAIT_TIMEOUT)
return ETIMEDOUT;
else
return 0;
}
//
// Threads.
//
void
_Jv_InitThreads (void)
{
_Jv_ThreadKey = TlsAlloc();
_Jv_ThreadDataKey = TlsAlloc();
daemon_mutex = CreateMutex(NULL, 0, NULL);
daemon_cond = CreateEvent(NULL, 0, 0, NULL);
non_daemon_count = 0;
}
_Jv_Thread_t *
_Jv_ThreadInitData (java::lang::Thread *)
{
_Jv_Thread_t *data = new _Jv_Thread_t;
data->flags = 0;
return data;
}
void
_Jv_ThreadDestroyData (_Jv_Thread_t *data)
{
delete 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);
}
}
// 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 __stdcall
really_start (void* x)
{
struct starter *info = (struct starter *) x;
TlsSetValue (_Jv_ThreadKey, info->object);
TlsSetValue (_Jv_ThreadDataKey, info->data);
info->method (info->object);
if (! (info->data->flags & FLAG_DAEMON))
{
WaitForSingleObject (daemon_mutex, INFINITE);
non_daemon_count--;
if (! non_daemon_count)
PulseEvent (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->object = thread;
info->data = data;
if (! thread->isDaemon ())
{
WaitForSingleObject (daemon_mutex, INFINITE);
non_daemon_count++;
ReleaseMutex (daemon_mutex);
}
else
data->flags |= FLAG_DAEMON;
HANDLE h = 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)
SignalObjectAndWait(daemon_mutex, daemon_cond, INFINITE, 0);
ReleaseMutex(daemon_mutex);
}
void
_Jv_ThreadInterrupt (_Jv_Thread_t *data)
{
MessageBox(NULL, "Unimplemented", "win32-threads.cc:_Jv_ThreadInterrupt", MB_OK);
// FIXME:
}