| // 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; |
| |
| // 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) |
| 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: |
| } |