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- /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
- /*
- * The contents of this file are subject to the Netscape Public License
- * Version 1.0 (the "NPL"); you may not use this file except in
- * compliance with the NPL. You may obtain a copy of the NPL at
- * http://www.mozilla.org/NPL/
- *
- * Software distributed under the NPL is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
- * for the specific language governing rights and limitations under the
- * NPL.
- *
- * The Initial Developer of this code under the NPL is Netscape
- * Communications Corporation. Portions created by Netscape are
- * Copyright (C) 1998 Netscape Communications Corporation. All Rights
- * Reserved.
- */
-
- /*
- ** File: ptthread.c
- ** Descritpion: Implemenation for threds using pthreds
- ** Exports: ptthread.h
- */
-
- #if defined(_PR_PTHREADS) || defined(_PR_DCETHREADS)
-
- #include "prlog.h"
- #include "primpl.h"
- #include "prpdce.h"
-
- #include <pthread.h>
- #include <string.h>
- #include <signal.h>
-
- /*
- * Record whether or not we have the privilege to set the scheduling
- * policy and priority of threads. 0 means that privilege is available.
- * EPERM means that privilege is not available.
- */
-
- PRIntn pt_schedpriv;
-
- struct _PT_Bookeeping pt_book = {0};
-
- static void init_pthread_gc_support(void);
-
- static PRIntn pt_PriorityMap(PRThreadPriority pri)
- {
- return pt_book.minPrio +
- pri * (pt_book.maxPrio - pt_book.minPrio) / PR_PRIORITY_LAST;
- }
-
- /*
- ** Initialize a stack for a native pthread thread
- */
- static void _PR_InitializeStack(PRThreadStack *ts)
- {
- if( ts && (ts->stackTop == 0) ) {
- ts->allocBase = (char *) &ts;
- ts->allocSize = ts->stackSize;
-
- /*
- ** Setup stackTop and stackBottom values.
- */
- #ifdef HAVE_STACK_GROWING_UP
- ts->stackBottom = ts->allocBase + ts->stackSize;
- ts->stackTop = ts->allocBase;
- #else
- ts->stackTop = ts->allocBase;
- ts->stackBottom = ts->allocBase - ts->stackSize;
- #endif
- }
- }
-
- static void *_pt_root(void *arg)
- {
- PRIntn rv;
- PRThread *thred = (PRThread*)arg;
- PRBool detached = (thred->state & PT_THREAD_DETACHED) ? PR_TRUE : PR_FALSE;
-
- /*
- * Both the parent thread and this new thread set thred->id.
- * The new thread must ensure that thred->id is set before
- * it executes its startFunc. The parent thread must ensure
- * that thred->id is set before PR_CreateThread() returns.
- * Both threads set thred->id without holding a lock. Since
- * they are writing the same value, this unprotected double
- * write should be safe.
- */
- thred->id = pthread_self();
-
- /*
- ** DCE Threads can't detach during creation, so do it late.
- ** I would like to do it only here, but that doesn't seem
- ** to work.
- */
- #if defined(_PR_DCETHREADS)
- if (detached)
- {
- /* pthread_detach() modifies its argument, so we must pass a copy */
- pthread_t self = thred->id;
- rv = pthread_detach(&self);
- PR_ASSERT(0 == rv);
- }
- #endif /* defined(_PR_DCETHREADS) */
-
- /* Set up the thread stack information */
- _PR_InitializeStack(thred->stack);
-
- /*
- * Set within the current thread the pointer to our object.
- * This object will be deleted when the thread termintates,
- * whether in a join or detached (see _PR_InitThreads()).
- */
- rv = pthread_setspecific(pt_book.key, thred);
- PR_ASSERT(0 == rv);
-
- /* make the thread visible to the rest of the runtime */
- PR_Lock(pt_book.ml);
-
- /* If this is a GCABLE thread, set its state appropriately */
- if (thred->suspend & PT_THREAD_SETGCABLE)
- thred->state |= PT_THREAD_GCABLE;
- thred->suspend = 0;
-
- thred->prev = pt_book.last;
- pt_book.last->next = thred;
- thred->next = NULL;
- pt_book.last = thred;
- PR_Unlock(pt_book.ml);
-
- thred->startFunc(thred->arg); /* make visible to the client */
-
- /* unhook the thread from the runtime */
- PR_Lock(pt_book.ml);
- if (thred->state & PT_THREAD_SYSTEM)
- pt_book.system -= 1;
- else if (--pt_book.user == pt_book.this_many)
- PR_NotifyAllCondVar(pt_book.cv);
- thred->prev->next = thred->next;
- if (NULL == thred->next)
- pt_book.last = thred->prev;
- else
- thred->next->prev = thred->prev;
-
- /*
- * At this moment, PR_CreateThread() may not have set thred->id yet.
- * It is safe for a detached thread to free thred only after
- * PR_CreateThread() has set thred->id.
- */
- if (detached)
- {
- while (!thred->okToDelete)
- PR_WaitCondVar(pt_book.cv, PR_INTERVAL_NO_TIMEOUT);
- }
- PR_Unlock(pt_book.ml);
-
- /* last chance to delete this puppy if the thread is detached */
- if (detached)
- {
- PR_DELETE(thred->stack);
- #if defined(DEBUG)
- memset(thred, 0xaf, sizeof(PRThread));
- #endif
- PR_DELETE(thred);
- }
-
- rv = pthread_setspecific(pt_book.key, NULL);
- PR_ASSERT(0 == rv);
- return NULL;
- } /* _pt_root */
-
- static PRThread* _PR_CreateThread(
- PRThreadType type, void (*start)(void *arg),
- void *arg, PRThreadPriority priority, PRThreadScope scope,
- PRThreadState state, PRUint32 stackSize, PRBool isGCAble)
- {
- int rv;
- PRThread *thred;
- pthread_attr_t tattr;
-
- if (!_pr_initialized) _PR_ImplicitInitialization();
-
- if ((PRIntn)PR_PRIORITY_FIRST > (PRIntn)priority)
- priority = PR_PRIORITY_FIRST;
- else if ((PRIntn)PR_PRIORITY_LAST < (PRIntn)priority)
- priority = PR_PRIORITY_LAST;
-
- rv = PTHREAD_ATTR_INIT(&tattr);
- PR_ASSERT(0 == rv);
-
- if (EPERM != pt_schedpriv)
- {
- #if !defined(_PR_DCETHREADS) && !defined(FREEBSD)
- struct sched_param schedule;
- #endif
-
- #if !defined(FREEBSD)
- rv = pthread_attr_setinheritsched(&tattr, PTHREAD_EXPLICIT_SCHED);
- PR_ASSERT(0 == rv);
- #endif
-
- /* Use the default scheduling policy */
-
- #if defined(_PR_DCETHREADS)
- rv = pthread_attr_setprio(&tattr, pt_PriorityMap(priority));
- PR_ASSERT(0 == rv);
- #elif !defined(FREEBSD)
- rv = pthread_attr_getschedparam(&tattr, &schedule);
- PR_ASSERT(0 == rv);
- schedule.sched_priority = pt_PriorityMap(priority);
- rv = pthread_attr_setschedparam(&tattr, &schedule);
- PR_ASSERT(0 == rv);
- #endif /* !defined(_PR_DCETHREADS) */
- }
-
- /*
- * DCE threads can't set detach state before creating the thread.
- * AIX can't set detach late. Why can't we all just get along?
- */
- #if !defined(_PR_DCETHREADS)
- rv = pthread_attr_setdetachstate(&tattr,
- ((PR_JOINABLE_THREAD == state) ?
- PTHREAD_CREATE_JOINABLE : PTHREAD_CREATE_DETACHED));
- PR_ASSERT(0 == rv);
- #endif /* !defined(_PR_DCETHREADS) */
-
- /*
- * HPUX only supports PTHREAD_SCOPE_SYSTEM.
- * IRIX only supports PTHREAD_SCOPE_PROCESS.
- * OSF1 only supports PTHREAD_SCOPE_PROCESS.
- * AIX only supports PTHREAD_SCOPE_SYSTEM.
- */
- #if defined(SOLARIS)
- rv = pthread_attr_setscope(&tattr,
- ((PR_GLOBAL_THREAD == scope) ?
- PTHREAD_SCOPE_SYSTEM : PTHREAD_SCOPE_PROCESS));
- PR_ASSERT(0 == rv);
- #endif
-
- #if defined(IRIX)
- if ((16 * 1024) > stackSize) stackSize = (16 * 1024); /* IRIX minimum */
- else
- #endif
- if (0 == stackSize) stackSize = (64 * 1024); /* default == 64K */
- /*
- * Linux doesn't have pthread_attr_setstacksize.
- */
- #ifndef LINUX
- rv = pthread_attr_setstacksize(&tattr, stackSize);
- PR_ASSERT(0 == rv);
- #endif
-
- thred = PR_NEWZAP(PRThread);
- if (thred != NULL)
- {
- pthread_t id;
-
- thred->arg = arg;
- thred->startFunc = start;
- thred->priority = priority;
- if (PR_UNJOINABLE_THREAD == state)
- thred->state |= PT_THREAD_DETACHED;
- if (PR_GLOBAL_THREAD == scope)
- thred->state |= PT_THREAD_GLOBAL;
- if (PR_SYSTEM_THREAD == type)
- thred->state |= PT_THREAD_SYSTEM;
-
- thred->suspend =(isGCAble) ? PT_THREAD_SETGCABLE : 0;
-
- thred->stack = PR_NEWZAP(PRThreadStack);
- if (thred->stack == NULL) {
- PR_DELETE(thred); /* all that work ... poof! */
- thred = NULL; /* and for what? */
- goto done;
- }
- thred->stack->stackSize = stackSize;
- thred->stack->thr = thred;
-
- #ifdef PT_NO_SIGTIMEDWAIT
- pthread_mutex_init(&thred->suspendResumeMutex,NULL);
- pthread_cond_init(&thred->suspendResumeCV,NULL);
- #endif
-
- /* make the thread counted to the rest of the runtime */
- PR_Lock(pt_book.ml);
- if (thred->state & PT_THREAD_SYSTEM)
- pt_book.system += 1;
- else pt_book.user += 1;
- PR_Unlock(pt_book.ml);
-
- /*
- * We pass a pointer to a local copy (instead of thred->id)
- * to pthread_create() because who knows what wacky things
- * pthread_create() may be doing to its argument.
- */
- if (PTHREAD_CREATE(&id, tattr, _pt_root, thred) != 0)
- {
- PR_Lock(pt_book.ml);
- if (thred->state & PT_THREAD_SYSTEM)
- pt_book.system -= 1;
- else if (--pt_book.user == pt_book.this_many)
- PR_NotifyAllCondVar(pt_book.cv);
- PR_Unlock(pt_book.ml);
-
- PR_DELETE(thred->stack);
- PR_DELETE(thred); /* all that work ... poof! */
- thred = NULL; /* and for what? */
- goto done;
- }
-
- /*
- * Both the parent thread and this new thread set thred->id.
- * The parent thread must ensure that thred->id is set before
- * PR_CreateThread() returns. (See comments in _pt_root().)
- */
- thred->id = id;
-
- /*
- * If the new thread is detached, tell it that PR_CreateThread()
- * has set thred->id so it's ok to delete thred.
- */
- if (PR_UNJOINABLE_THREAD == state)
- {
- PR_Lock(pt_book.ml);
- thred->okToDelete = PR_TRUE;
- PR_NotifyAllCondVar(pt_book.cv);
- PR_Unlock(pt_book.ml);
- }
- }
-
- done:
- rv = PTHREAD_ATTR_DESTROY(&tattr);
- PR_ASSERT(0 == rv);
-
- return thred;
- } /* _PR_CreateThread */
-
- PR_IMPLEMENT(PRThread*) PR_CreateThread(
- PRThreadType type, void (*start)(void *arg), void *arg,
- PRThreadPriority priority, PRThreadScope scope,
- PRThreadState state, PRUint32 stackSize)
- {
- return _PR_CreateThread(
- type, start, arg, priority, scope, state, stackSize, PR_FALSE);
- } /* PR_CreateThread */
-
- PR_IMPLEMENT(PRThread*) PR_CreateThreadGCAble(
- PRThreadType type, void (*start)(void *arg), void *arg,
- PRThreadPriority priority, PRThreadScope scope,
- PRThreadState state, PRUint32 stackSize)
- {
- return _PR_CreateThread(
- type, start, arg, priority, scope, state, stackSize, PR_TRUE);
- } /* PR_CreateThreadGCAble */
-
- PR_IMPLEMENT(void*) GetExecutionEnvironment(PRThread *thred)
- {
- return thred->environment;
- } /* GetExecutionEnvironment */
-
- PR_IMPLEMENT(void) SetExecutionEnvironment(PRThread *thred, void *env)
- {
- thred->environment = env;
- } /* SetExecutionEnvironment */
-
- PR_IMPLEMENT(PRThread*) PR_AttachThread(
- PRThreadType type, PRThreadPriority priority, PRThreadStack *stack)
- {
- PRThread *thred = NULL;
- void *privateData = NULL;
-
- /*
- * NSPR must have been initialized when PR_AttachThread is called.
- * We cannot have PR_AttachThread call implicit initialization
- * because if multiple threads call PR_AttachThread simultaneously,
- * NSPR may be initialized more than once.
- */
- if (!_pr_initialized) {
- /* Since NSPR is not initialized, we cannot call PR_SetError. */
- return NULL;
- }
-
- PTHREAD_GETSPECIFIC(pt_book.key, privateData);
- if (NULL != privateData)
- {
- PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
- return NULL;
- }
- thred = PR_NEWZAP(PRThread);
- if (NULL == thred) PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
- else
- {
- int rv;
-
- if ((PRIntn)PR_PRIORITY_FIRST > (PRIntn)priority)
- priority = PR_PRIORITY_FIRST;
- else if ((PRIntn)PR_PRIORITY_LAST < (PRIntn)priority)
- priority = PR_PRIORITY_LAST;
-
- thred->priority = priority;
- thred->id = pthread_self();
- rv = pthread_setspecific(pt_book.key, thred);
- PR_ASSERT(0 == rv);
-
- PR_Lock(pt_book.ml);
- if (PR_SYSTEM_THREAD == type)
- {
- pt_book.system += 1;
- thred->state |= PT_THREAD_SYSTEM;
- }
- else pt_book.user += 1;
-
- /* then put it into the list */
- thred->prev = pt_book.last;
- pt_book.last->next = thred;
- thred->next = NULL;
- pt_book.last = thred;
- PR_Unlock(pt_book.ml);
-
- }
- return thred; /* may be NULL */
- } /* PR_AttachThread */
-
- PR_IMPLEMENT(PRStatus) PR_JoinThread(PRThread *thred)
- {
- int rv = -1;
- void *result = NULL;
- PR_ASSERT(thred != NULL);
-
- if ((0xafafafaf == thred->state)
- || (PT_THREAD_DETACHED & thred->state))
- {
- /*
- * This might be a bad address, but if it isn't, the state should
- * either be an unjoinable thread or it's already had the object
- * deleted. However, the client that called join on a detached
- * thread deserves all the rath I can muster....
- */
- PR_SetError(PR_ILLEGAL_ACCESS_ERROR, 0);
- PR_LogPrint(
- "PR_JoinThread: 0x%X not joinable | already smashed\n", thred);
-
- PR_ASSERT((0xafafafaf == thred->state)
- || (PT_THREAD_DETACHED & thred->state));
- }
- else
- {
- pthread_t id = thred->id;
- rv = pthread_join(id, &result);
- if (0 != rv)
- PR_SetError(PR_UNKNOWN_ERROR, errno);
- PR_DELETE(thred->stack);
- memset(thred, 0xaf, sizeof(PRThread));
- PR_ASSERT(result == NULL);
- PR_DELETE(thred);
- }
- return (0 == rv) ? PR_SUCCESS : PR_FAILURE;
- } /* PR_JoinThread */
-
- PR_IMPLEMENT(void) PR_DetachThread()
- {
- void *tmp;
- PTHREAD_GETSPECIFIC(pt_book.key, tmp);
- PR_ASSERT(NULL != tmp);
-
- if (NULL != tmp)
- {
- int rv;
- PRThread *thred = (PRThread*)tmp;
-
- PR_Lock(pt_book.ml);
- if (thred->state & PT_THREAD_SYSTEM)
- pt_book.system -= 1;
- else if (--pt_book.user == pt_book.this_many)
- PR_NotifyAllCondVar(pt_book.cv);
- thred->prev->next = thred->next;
- if (NULL == thred->next)
- pt_book.last = thred->prev;
- else
- thred->next->prev = thred->prev;
- PR_Unlock(pt_book.ml);
-
- rv = pthread_setspecific(pt_book.key, NULL);
- PR_ASSERT(0 == rv);
- PR_DELETE(thred->stack);
- memset(thred, 0xaf, sizeof(PRThread));
- PR_DELETE(thred);
- }
- } /* PR_DetachThread */
-
- PR_IMPLEMENT(PRThread*) PR_GetCurrentThread()
- {
- void *thred;
-
- if (!_pr_initialized) _PR_ImplicitInitialization();
-
- PTHREAD_GETSPECIFIC(pt_book.key, thred);
- PR_ASSERT(NULL != thred);
- return (PRThread*)thred;
- } /* PR_GetCurrentThread */
-
- PR_IMPLEMENT(PRThreadScope) PR_GetThreadScope(const PRThread *thred)
- {
- return (thred->state & PT_THREAD_GLOBAL) ?
- PR_GLOBAL_THREAD : PR_LOCAL_THREAD;
- } /* PR_GetThreadScope() */
-
- PR_IMPLEMENT(PRThreadType) PR_GetThreadType(const PRThread *thred)
- {
- return (thred->state & PT_THREAD_SYSTEM) ?
- PR_SYSTEM_THREAD : PR_USER_THREAD;
- }
-
- PR_IMPLEMENT(PRThreadState) PR_GetThreadState(const PRThread *thred)
- {
- return (thred->state & PT_THREAD_DETACHED) ?
- PR_UNJOINABLE_THREAD : PR_JOINABLE_THREAD;
- } /* PR_GetThreadState */
-
- PR_IMPLEMENT(PRThreadPriority) PR_GetThreadPriority(const PRThread *thred)
- {
- PR_ASSERT(thred != NULL);
- return thred->priority;
- } /* PR_GetThreadPriority */
-
- PR_IMPLEMENT(void) PR_SetThreadPriority(PRThread *thred, PRThreadPriority newPri)
- {
- PRIntn rv;
-
- PR_ASSERT(NULL != thred);
-
- if ((PRIntn)PR_PRIORITY_FIRST > (PRIntn)newPri)
- newPri = PR_PRIORITY_FIRST;
- else if ((PRIntn)PR_PRIORITY_LAST < (PRIntn)newPri)
- newPri = PR_PRIORITY_LAST;
-
- #if defined(_PR_DCETHREADS)
- rv = pthread_setprio(thred->id, pt_PriorityMap(newPri));
- /* pthread_setprio returns the old priority */
- PR_ASSERT(-1 != rv);
- #elif !defined(FREEBSD)
- if (EPERM != pt_schedpriv)
- {
- int policy;
- struct sched_param schedule;
-
- rv = pthread_getschedparam(thred->id, &policy, &schedule);
- PR_ASSERT(0 == rv);
- schedule.sched_priority = pt_PriorityMap(newPri);
- rv = pthread_setschedparam(thred->id, policy, &schedule);
- PR_ASSERT(0 == rv);
- }
- #endif
-
- thred->priority = newPri;
- } /* PR_SetThreadPriority */
-
- PR_IMPLEMENT(PRStatus) PR_NewThreadPrivateIndex(
- PRUintn *newIndex, PRThreadPrivateDTOR destructor)
- {
- int rv;
-
- if (!_pr_initialized) _PR_ImplicitInitialization();
-
- rv = PTHREAD_KEY_CREATE((pthread_key_t*)newIndex, destructor);
-
- if (0 == rv)
- {
- PR_Lock(pt_book.ml);
- if (*newIndex >= pt_book.highwater)
- pt_book.highwater = *newIndex + 1;
- PR_Unlock(pt_book.ml);
- return PR_SUCCESS;
- }
- PR_SetError(PR_UNKNOWN_ERROR, rv);
- return PR_FAILURE;
- } /* PR_NewThreadPrivateIndex */
-
- PR_IMPLEMENT(PRStatus) PR_SetThreadPrivate(PRUintn index, void *priv)
- {
- PRIntn rv;
- if ((pthread_key_t)index >= pt_book.highwater)
- {
- PR_SetError(PR_TPD_RANGE_ERROR, 0);
- return PR_FAILURE;
- }
- rv = pthread_setspecific((pthread_key_t)index, priv);
- PR_ASSERT(0 == rv);
- if (0 == rv) return PR_SUCCESS;
-
- PR_SetError(PR_UNKNOWN_ERROR, rv);
- return PR_FAILURE;
- } /* PR_SetThreadPrivate */
-
- PR_IMPLEMENT(void*) PR_GetThreadPrivate(PRUintn index)
- {
- void *result = NULL;
- if ((pthread_key_t)index < pt_book.highwater)
- PTHREAD_GETSPECIFIC((pthread_key_t)index, result);
- return result;
- } /* PR_GetThreadPrivate */
-
- PR_IMPLEMENT(PRStatus) PR_Interrupt(PRThread *thred)
- {
- /*
- ** If the target thread indicates that it's waiting,
- ** find the condition and broadcast to it. Broadcast
- ** since we don't know which thread (if there are more
- ** than one). This sounds risky, but clients must
- ** test their invariants when resumed from a wait and
- ** I don't expect very many threads to be waiting on
- ** a single condition and I don't expect interrupt to
- ** be used very often.
- */
- PRCondVar *victim;
- PR_ASSERT(thred != NULL);
- thred->state |= PT_THREAD_ABORTED;
- victim = thred->waiting;
- if (NULL != victim)
- {
- PRIntn haveLock = pthread_equal(victim->lock->owner, pthread_self());
- if (!haveLock) PR_Lock(victim->lock);
- PR_NotifyAllCondVar(victim);
- if (!haveLock) PR_Unlock(victim->lock);
- }
- return PR_SUCCESS;
- } /* PR_Interrupt */
-
- PR_IMPLEMENT(void) PR_ClearInterrupt()
- {
- PRThread *me = PR_CurrentThread();
- me->state &= ~PT_THREAD_ABORTED;
- } /* PR_ClearInterrupt */
-
- PR_IMPLEMENT(PRStatus) PR_Yield()
- {
- static PRBool warning = PR_TRUE;
- if (warning) warning = _PR_Obsolete(
- "PR_Yield()", "PR_Sleep(PR_INTERVAL_NO_WAIT)");
- return PR_Sleep(PR_INTERVAL_NO_WAIT);
- }
-
- PR_IMPLEMENT(PRStatus) PR_Sleep(PRIntervalTime ticks)
- {
- PRStatus rv;
-
- if (!_pr_initialized) _PR_ImplicitInitialization();
-
- if (PR_INTERVAL_NO_WAIT == ticks)
- {
- PTHREAD_YIELD();
- rv = PR_SUCCESS;
- }
- else
- {
- PRCondVar *cv = PR_NewCondVar(pt_book.ml);
- PR_ASSERT(cv != NULL);
- PR_Lock(pt_book.ml);
- rv = PR_WaitCondVar(cv, ticks);
- PR_Unlock(pt_book.ml);
- PR_DestroyCondVar(cv);
- }
- return rv;
- } /* PR_Sleep */
-
- void _PR_InitThreads(
- PRThreadType type, PRThreadPriority priority, PRUintn maxPTDs)
- {
- int rv;
- PRThread *thred;
-
- /*
- ** These might be function evaluations
- */
- pt_book.minPrio = PT_PRIO_MIN;
- pt_book.maxPrio = PT_PRIO_MAX;
-
- PR_ASSERT(NULL == pt_book.ml);
- pt_book.ml = PR_NewLock();
- PR_ASSERT(NULL != pt_book.ml);
- pt_book.cv = PR_NewCondVar(pt_book.ml);
- PR_ASSERT(NULL != pt_book.cv);
- thred = PR_NEWZAP(PRThread);
- PR_ASSERT(NULL != thred);
- thred->arg = NULL;
- thred->startFunc = NULL;
- thred->priority = priority;
- thred->id = pthread_self();
-
- thred->state |= (PT_THREAD_DETACHED | PT_THREAD_PRIMORD);
- if (PR_SYSTEM_THREAD == type)
- {
- thred->state |= PT_THREAD_SYSTEM;
- pt_book.system += 1;
- pt_book.this_many = 0;
- }
- else
- {
- pt_book.user += 1;
- pt_book.this_many = 1;
- }
- thred->next = thred->prev = NULL;
- pt_book.first = pt_book.last = thred;
-
- thred->stack = PR_NEWZAP(PRThreadStack);
- PR_ASSERT(thred->stack != NULL);
- thred->stack->stackSize = 0;
- thred->stack->thr = thred;
- _PR_InitializeStack(thred->stack);
-
- /*
- * Create a key for our use to store a backpointer in the pthread
- * to our PRThread object. This object gets deleted when the thread
- * returns from its root in the case of a detached thread. Other
- * threads delete the objects in Join.
- *
- * NB: The destructor logic seems to have a bug so it isn't used.
- */
- rv = PTHREAD_KEY_CREATE(&pt_book.key, NULL);
- PR_ASSERT(0 == rv);
- rv = pthread_setspecific(pt_book.key, thred);
- PR_ASSERT(0 == rv);
-
- pt_schedpriv = PT_PRIVCHECK();
- PR_SetThreadPriority(thred, priority);
-
- /*
- * Linux pthreads use SIGUSR1 and SIGUSR2 internally, which
- * conflict with the use of these two signals in our GC support.
- * So we don't know how to support GC on Linux pthreads.
- */
- #if !defined(LINUX2_0) && !defined(FREEBSD)
- init_pthread_gc_support();
- #endif
-
- } /* _PR_InitThreads */
-
- PR_IMPLEMENT(PRStatus) PR_Cleanup()
- {
- PRThread *me = PR_CurrentThread();
- PR_LOG(_pr_thread_lm, PR_LOG_MIN, ("PR_Cleanup: shutting down NSPR"));
- PR_ASSERT(me->state & PT_THREAD_PRIMORD);
- if (me->state & PT_THREAD_PRIMORD)
- {
- PR_Lock(pt_book.ml);
- while (pt_book.user > pt_book.this_many)
- PR_WaitCondVar(pt_book.cv, PR_INTERVAL_NO_TIMEOUT);
- PR_Unlock(pt_book.ml);
-
- /*
- * I am not sure if it's safe to delete the cv and lock here,
- * since there may still be "system" threads around. If this
- * call isn't immediately prior to exiting, then there's a
- * problem.
- */
- if (0 == pt_book.system)
- {
- PR_DestroyCondVar(pt_book.cv); pt_book.cv = NULL;
- PR_DestroyLock(pt_book.ml); pt_book.ml = NULL;
- }
- PR_DELETE(me->stack);
- PR_DELETE(me);
- return PR_SUCCESS;
- }
- return PR_FAILURE;
- } /* PR_Cleanup */
-
- PR_IMPLEMENT(void) PR_ProcessExit(PRIntn status)
- {
- _exit(status);
- }
-
- /*
- * $$$
- * The following two thread-to-processor affinity functions are not
- * yet implemented for pthreads. By the way, these functions should return
- * PRStatus rather than PRInt32 to indicate the success/failure status.
- * $$$
- */
-
- PR_IMPLEMENT(PRInt32) PR_GetThreadAffinityMask(PRThread *thread, PRUint32 *mask)
- {
- return 0; /* not implemented */
- }
-
- PR_IMPLEMENT(PRInt32) PR_SetThreadAffinityMask(PRThread *thread, PRUint32 mask )
- {
- return 0; /* not implemented */
- }
-
- PR_IMPLEMENT(void)
- PR_SetThreadDumpProc(PRThread* thread, PRThreadDumpProc dump, void *arg)
- {
- thread->dump = dump;
- thread->dumpArg = arg;
- }
-
- /*
- * Garbage collection support follows.
- */
-
- #if defined(_PR_DCETHREADS)
-
- /*
- * statics for Garbage Collection support. We don't need to protect these
- * signal masks since the garbage collector itself is protected by a lock
- * and multiple threads will not be garbage collecting at the same time.
- */
- static sigset_t javagc_vtalarm_sigmask;
- static sigset_t javagc_intsoff_sigmask;
-
- #else /* defined(_PR_DCETHREADS) */
-
- /* a bogus signal mask for forcing a timed wait */
- /* Not so bogus in AIX as we really do a sigwait */
- static sigset_t sigwait_set;
-
- static struct timespec onemillisec = {0, 1000000L};
- static struct timespec hundredmillisec = {0, 100000000L};
-
- #endif /* defined(_PR_DCETHREADS) */
-
- static void suspend_signal_handler(PRIntn sig);
-
- #ifdef PT_NO_SIGTIMEDWAIT
- static void null_signal_handler(PRIntn sig);
- #endif
-
- static void init_pthread_gc_support()
- {
- PRIntn rv;
-
- #if defined(_PR_DCETHREADS)
- rv = sigemptyset(&javagc_vtalarm_sigmask);
- PR_ASSERT(0 == rv);
- rv = sigaddset(&javagc_vtalarm_sigmask, SIGVTALRM);
- PR_ASSERT(0 == rv);
- #else /* defined(_PR_DCETHREADS) */
- {
- struct sigaction sigact_usr2 = {0};
-
- sigact_usr2.sa_handler = suspend_signal_handler;
- sigact_usr2.sa_flags = SA_RESTART;
- sigemptyset (&sigact_usr2.sa_mask);
-
- rv = sigaction (SIGUSR2, &sigact_usr2, NULL);
- PR_ASSERT(0 == rv);
-
- sigemptyset (&sigwait_set);
- #if defined(PT_NO_SIGTIMEDWAIT)
- sigaddset (&sigwait_set, SIGUSR1);
- #else
- sigaddset (&sigwait_set, SIGUSR2);
- #endif /* defined(PT_NO_SIGTIMEDWAIT) */
- }
- #if defined(PT_NO_SIGTIMEDWAIT)
- {
- struct sigaction sigact_null = {0};
- sigact_null.sa_handler = null_signal_handler;
- sigact_null.sa_flags = SA_RESTART;
- sigemptyset (&sigact_null.sa_mask);
- rv = sigaction (SIGUSR1, &sigact_null, NULL);
- PR_ASSERT(0 ==rv);
- }
- #endif /* defined(PT_NO_SIGTIMEDWAIT) */
- #endif /* defined(_PR_DCETHREADS) */
- }
-
- PR_IMPLEMENT(void) PR_SetThreadGCAble()
- {
- PR_Lock(pt_book.ml);
- PR_CurrentThread()->state |= PT_THREAD_GCABLE;
- PR_Unlock(pt_book.ml);
- }
-
- PR_IMPLEMENT(void) PR_ClearThreadGCAble()
- {
- PR_Lock(pt_book.ml);
- PR_CurrentThread()->state &= (~PT_THREAD_GCABLE);
- PR_Unlock(pt_book.ml);
- }
-
- #if defined(DEBUG)
- static PRBool suspendAllOn = PR_FALSE;
- #endif
-
- static PRBool suspendAllSuspended = PR_FALSE;
-
- /* Are all GCAble threads (except gc'ing thread) suspended? */
- PR_IMPLEMENT(PRBool) PR_SuspendAllSuspended()
- {
- return suspendAllSuspended;
- } /* PR_SuspendAllSuspended */
-
- PR_IMPLEMENT(PRStatus) PR_EnumerateThreads(PREnumerator func, void *arg)
- {
- PRIntn count = 0;
- PRStatus rv = PR_SUCCESS;
- PRThread* thred = pt_book.first;
- PRThread *me = PR_CurrentThread();
-
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_EnumerateThreads\n"));
- /*
- * $$$
- * Need to suspend all threads other than me before doing this.
- * This is really a gross and disgusting thing to do. The only
- * good thing is that since all other threads are suspended, holding
- * the lock during a callback seems like child's play.
- * $$$
- */
- PR_ASSERT(suspendAllOn);
-
- while (thred != NULL)
- {
- /* Steve Morse, 4-23-97: Note that we can't walk a queue by taking
- * qp->next after applying the function "func". In particular, "func"
- * might remove the thread from the queue and put it into another one in
- * which case qp->next no longer points to the next entry in the original
- * queue.
- *
- * To get around this problem, we save qp->next in qp_next before applying
- * "func" and use that saved value as the next value after applying "func".
- */
- PRThread* next = thred->next;
-
- if (thred->state & PT_THREAD_GCABLE)
- {
- #if !defined(_PR_DCETHREADS)
- PR_ASSERT((thred == me) || (thred->suspend & PT_THREAD_SUSPENDED));
- #endif
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
- ("In PR_EnumerateThreads callback thread %X thid = %X\n",
- thred, thred->id));
-
- rv = func(thred, count++, arg);
- if (rv != PR_SUCCESS)
- return rv;
- }
- thred = next;
- }
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
- ("End PR_EnumerateThreads count = %d \n", count));
- return rv;
- } /* PR_EnumerateThreads */
-
- /*
- * PR_SuspendAll and PR_ResumeAll are called during garbage collection. The strategy
- * we use is to send a SIGUSR2 signal to every gc able thread that we intend to suspend.
- * The signal handler will record the stack pointer and will block until resumed by
- * the resume call. Since the signal handler is the last routine called for the
- * suspended thread, the stack pointer will also serve as a place where all the
- * registers have been saved on the stack for the previously executing routines.
- *
- * Through global variables, we also make sure that PR_Suspend and PR_Resume does not
- * proceed until the thread is suspended or resumed.
- */
-
- #if !defined(_PR_DCETHREADS)
-
- /*
- * In the signal handler, we can not use condition variable notify or wait.
- * This does not work consistently across all pthread platforms. We also can not
- * use locking since that does not seem to work reliably across platforms.
- * Only thing we can do is yielding while testing for a global condition
- * to change. This does work on pthread supported platforms. We may have
- * to play with priortities if there are any problems detected.
- */
-
- /*
- * In AIX, you cannot use ANY pthread calls in the signal handler except perhaps
- * pthread_yield. But that is horribly inefficient. Hence we use only sigwait, no
- * sigtimedwait is available. We need to use another user signal, SIGUSR1. Actually
- * SIGUSR1 is also used by exec in Java. So our usage here breaks the exec in Java,
- * for AIX. You cannot use pthread_cond_wait or pthread_delay_np in the signal
- * handler as all synchronization mechanisms just break down.
- */
-
- #if defined(PT_NO_SIGTIMEDWAIT)
- static void null_signal_handler(PRIntn sig)
- {
- return;
- }
- #endif
-
- static void suspend_signal_handler(PRIntn sig)
- {
- PRThread *me = PR_CurrentThread();
-
- PR_ASSERT(me != NULL);
- PR_ASSERT(me->state & PT_THREAD_GCABLE);
- PR_ASSERT((me->suspend & PT_THREAD_SUSPENDED) == 0);
-
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
- ("Begin suspend_signal_handler thred %X thread id = %X\n",
- me, me->id));
-
- /*
- * save stack pointer
- */
- me->sp = &me;
-
- /*
- At this point, the thread's stack pointer has been saved,
- And it is going to enter a wait loop until it is resumed.
- So it is _really_ suspended
- */
-
- me->suspend |= PT_THREAD_SUSPENDED;
-
- /*
- * now, block current thread
- */
- #if defined(PT_NO_SIGTIMEDWAIT)
- pthread_cond_signal(&me->suspendResumeCV);
- while (me->suspend & PT_THREAD_SUSPENDED)
- {
- #if !defined(FREEBSD) /*XXX*/
- PRIntn rv;
- sigwait(&sigwait_set, &rv);
- #endif
- }
- me->suspend |= PT_THREAD_RESUMED;
- pthread_cond_signal(&me->suspendResumeCV);
- #else /* defined(PT_NO_SIGTIMEDWAIT) */
- while (me->suspend & PT_THREAD_SUSPENDED)
- {
- PRIntn rv = sigtimedwait(&sigwait_set, NULL, &hundredmillisec);
- PR_ASSERT(-1 == rv);
- }
- me->suspend |= PT_THREAD_RESUMED;
- #endif
-
- /*
- * At this point, thread has been resumed, so set a global condition.
- * The ResumeAll needs to know that this has really been resumed.
- * So the signal handler sets a flag which PR_ResumeAll will reset.
- * The PR_ResumeAll must reset this flag ...
- */
-
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
- ("End suspend_signal_handler thred = %X tid = %X\n", me, me->id));
- } /* suspend_signal_handler */
-
- static void PR_SuspendSet(PRThread *thred)
- {
- PRIntn rv;
-
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
- ("PR_SuspendSet thred %X thread id = %X\n", thred, thred->id));
-
-
- /*
- * Check the thread state and signal the thread to suspend
- */
-
- PR_ASSERT((thred->suspend & PT_THREAD_SUSPENDED) == 0);
-
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
- ("doing pthread_kill in PR_SuspendSet thred %X tid = %X\n",
- thred, thred->id));
- rv = pthread_kill (thred->id, SIGUSR2);
- PR_ASSERT(0 == rv);
- }
-
- static void PR_SuspendTest(PRThread *thred)
- {
- PRIntn rv;
-
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
- ("Begin PR_SuspendTest thred %X thread id = %X\n", thred, thred->id));
-
-
- /*
- * Wait for the thread to be really suspended. This happens when the
- * suspend signal handler stores the stack pointer and sets the state
- * to suspended.
- */
-
- #if defined(PT_NO_SIGTIMEDWAIT)
- pthread_mutex_lock(&thred->suspendResumeMutex);
- while ((thred->suspend & PT_THREAD_SUSPENDED) == 0)
- {
- pthread_cond_timedwait(
- &thred->suspendResumeCV, &thred->suspendResumeMutex, &onemillisec);
- }
- pthread_mutex_unlock(&thred->suspendResumeMutex);
- #else
- while ((thred->suspend & PT_THREAD_SUSPENDED) == 0)
- {
- rv = sigtimedwait(&sigwait_set, NULL, &onemillisec);
- PR_ASSERT(-1 == rv);
- }
- #endif
-
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
- ("End PR_SuspendTest thred %X tid %X\n", thred, thred->id));
- } /* PR_SuspendTest */
-
- PR_IMPLEMENT(void) PR_ResumeSet(PRThread *thred)
- {
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
- ("PR_ResumeSet thred %X thread id = %X\n", thred, thred->id));
-
- /*
- * Clear the global state and set the thread state so that it will
- * continue past yield loop in the suspend signal handler
- */
-
- PR_ASSERT(thred->suspend & PT_THREAD_SUSPENDED);
-
-
- thred->suspend &= ~PT_THREAD_SUSPENDED;
-
- #if defined(PT_NO_SIGTIMEDWAIT)
- pthread_kill(thred->id, SIGUSR1);
- #endif
-
- } /* PR_ResumeSet */
-
- PR_IMPLEMENT(void) PR_ResumeTest(PRThread *thred)
- {
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
- ("Begin PR_ResumeTest thred %X thread id = %X\n", thred, thred->id));
-
- /*
- * Wait for the threads resume state to change
- * to indicate it is really resumed
- */
- #if defined(PT_NO_SIGTIMEDWAIT)
- pthread_mutex_lock(&thred->suspendResumeMutex);
- while ((thred->suspend & PT_THREAD_RESUMED) == 0)
- {
- pthread_cond_timedwait(
- &thred->suspendResumeCV, &thred->suspendResumeMutex, &onemillisec);
- }
- pthread_mutex_unlock(&thred->suspendResumeMutex);
- #else
- while ((thred->suspend & PT_THREAD_RESUMED) == 0) {
- PRIntn rv = sigtimedwait(&sigwait_set, NULL, &onemillisec);
- PR_ASSERT(-1 == rv);
- }
- #endif
-
- thred->suspend &= ~PT_THREAD_RESUMED;
-
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, (
- "End PR_ResumeTest thred %X tid %X\n", thred, thred->id));
- } /* PR_ResumeTest */
-
- PR_IMPLEMENT(void) PR_SuspendAll()
- {
- #ifdef DEBUG
- PRIntervalTime stime, etime;
- #endif
- PRThread* thred = pt_book.first;
- PRThread *me = PR_CurrentThread();
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_SuspendAll\n"));
- /*
- * Stop all threads which are marked GC able.
- */
- PR_Lock(pt_book.ml);
- #ifdef DEBUG
- suspendAllOn = PR_TRUE;
- stime = PR_IntervalNow();
- #endif
- while (thred != NULL)
- {
- if ((thred != me) && (thred->state & PT_THREAD_GCABLE))
- PR_SuspendSet(thred);
- thred = thred->next;
- }
-
- /* Wait till they are really suspended */
- thred = pt_book.first;
- while (thred != NULL)
- {
- if ((thred != me) && (thred->state & PT_THREAD_GCABLE))
- PR_SuspendTest(thred);
- thred = thred->next;
- }
-
- suspendAllSuspended = PR_TRUE;
-
- #ifdef DEBUG
- etime = PR_IntervalNow();
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,\
- ("End PR_SuspendAll (time %dms)\n",
- PR_IntervalToMilliseconds(etime - stime)));
- #endif
- } /* PR_SuspendAll */
-
- PR_IMPLEMENT(void) PR_ResumeAll()
- {
- #ifdef DEBUG
- PRIntervalTime stime, etime;
- #endif
- PRThread* thred = pt_book.first;
- PRThread *me = PR_CurrentThread();
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_ResumeAll\n"));
- /*
- * Resume all previously suspended GC able threads.
- */
- suspendAllSuspended = PR_FALSE;
- #ifdef DEBUG
- stime = PR_IntervalNow();
- #endif
-
- while (thred != NULL)
- {
- if ((thred != me) && (thred->state & PT_THREAD_GCABLE))
- PR_ResumeSet(thred);
- thred = thred->next;
- }
-
- thred = pt_book.first;
- while (thred != NULL)
- {
- if ((thred != me) && (thred->state & PT_THREAD_GCABLE))
- PR_ResumeTest(thred);
- thred = thred->next;
- }
-
- PR_Unlock(pt_book.ml);
- #ifdef DEBUG
- suspendAllOn = PR_FALSE;
- etime = PR_IntervalNow();
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
- ("End PR_ResumeAll (time %dms)\n",
- PR_IntervalToMilliseconds(etime - stime)));
- #endif
- } /* PR_ResumeAll */
-
- /* Return the stack pointer for the given thread- used by the GC */
- PR_IMPLEMENT(void *)PR_GetSP(PRThread *thred)
- {
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
- ("in PR_GetSP thred %X thid = %X, sp = %X \n",
- thred, thred->id, thred->sp));
- return thred->sp;
- } /* PR_GetSP */
-
- #else /* !defined(_PR_DCETHREADS) */
-
- /*
- * For DCE threads, there is no pthread_kill or a way of suspending or resuming a
- * particular thread. We will just disable the preemption (virtual timer alarm) and
- * let the executing thread finish the garbage collection. This stops all other threads
- * (GC able or not) and is very inefficient but there is no other choice.
- */
- PR_IMPLEMENT(void) PR_SuspendAll()
- {
- PRIntn rv;
-
- suspendAllOn = PR_TRUE;
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_SuspendAll\n"));
- /*
- * turn off preemption - i.e add virtual alarm signal to the set of
- * blocking signals
- */
- rv = sigprocmask(
- SIG_BLOCK, &javagc_vtalarm_sigmask, &javagc_intsoff_sigmask);
- PR_ASSERT(0 == rv);
- suspendAllSuspended = PR_TRUE;
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("End PR_SuspendAll\n"));
- } /* PR_SuspendAll */
-
- PR_IMPLEMENT(void) PR_ResumeAll()
- {
- PRIntn rv;
-
- suspendAllSuspended = PR_FALSE;
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_ResumeAll\n"));
- /* turn on preemption - i.e re-enable virtual alarm signal */
-
- rv = sigprocmask(SIG_SETMASK, &javagc_intsoff_sigmask, (sigset_t *)NULL);
- PR_ASSERT(0 == rv);
- suspendAllOn = PR_FALSE;
-
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("End PR_ResumeAll\n"));
- } /* PR_ResumeAll */
-
- /* Return the stack pointer for the given thread- used by the GC */
- PR_IMPLEMENT(void*)PR_GetSP(PRThread *thred)
- {
- pthread_t tid = thred->id;
- char *thread_tcb, *top_sp;
-
- /*
- * For HPUX DCE threads, pthread_t is a struct with the
- * following three fields (see pthread.h, dce/cma.h):
- * cma_t_address field1;
- * short int field2;
- * short int field3;
- * where cma_t_address is typedef'd to be either void*
- * or char*.
- */
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_GetSP\n"));
- thread_tcb = (char*)tid.field1;
- top_sp = *(char**)(thread_tcb + 128);
- PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("End PR_GetSP %X \n", top_sp));
- return top_sp;
- } /* PR_GetSP */
-
- #endif /* !defined(_PR_DCETHREADS) */
-
- #endif /* defined(_PR_PTHREADS) || defined(_PR_DCETHREADS) */
-
- /* ptthread.c */
-