solaris.c

Netscape NSPR库源码

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is the Netscape Portable Runtime (NSPR).
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are 
 * Copyright (C) 1998-2000 Netscape Communications Corporation.  All
 * Rights Reserved.
 * 
 * Contributor(s):
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL"), in which case the provisions of the GPL are applicable 
 * instead of those above.  If you wish to allow use of your 
 * version of this file only under the terms of the GPL and not to
 * allow others to use your version of this file under the MPL,
 * indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by
 * the GPL.  If you do not delete the provisions above, a recipient
 * may use your version of this file under either the MPL or the
 * GPL.
 */

#include "primpl.h"


extern PRBool suspendAllOn;
extern PRThread *suspendAllThread;

extern void _MD_SET_PRIORITY(_MDThread *md, PRThreadPriority newPri);

PRIntervalTime _MD_Solaris_TicksPerSecond(void)
{
    /*
     * Ticks have a 10-microsecond resolution.  So there are
     * 100000 ticks per second.
     */
    return 100000UL;
}

/* Interval timers, implemented using gethrtime() */

PRIntervalTime _MD_Solaris_GetInterval(void)
{
    union {
	hrtime_t hrt;  /* hrtime_t is a 64-bit (long long) integer */
	PRInt64 pr64;
    } time;
    PRInt64 resolution;
    PRIntervalTime ticks;

    time.hrt = gethrtime();  /* in nanoseconds */
    /*
     * Convert from nanoseconds to ticks.  A tick's resolution is
     * 10 microseconds, or 10000 nanoseconds.
     */
    LL_I2L(resolution, 10000);
    LL_DIV(time.pr64, time.pr64, resolution);
    LL_L2UI(ticks, time.pr64);
    return ticks;
}

#ifdef _PR_PTHREADS
void _MD_EarlyInit(void)
{
}

PRWord *_MD_HomeGCRegisters(PRThread *t, PRIntn isCurrent, PRIntn *np)
{
	*np = 0;
	return NULL;
}
#endif /* _PR_PTHREADS */

#if !defined(i386) && !defined(IS_64)
#if defined(_PR_HAVE_ATOMIC_OPS)
/* NOTE:
 * SPARC v9 (Ultras) do have an atomic test-and-set operation.  But
 * SPARC v8 doesn't.  We should detect in the init if we are running on
 * v8 or v9, and then use assembly where we can.
 *
 * This code uses the Solaris threads API.  It can be used in both the
 * pthreads and Solaris threads versions of nspr20 because "POSIX threads
 * and Solaris threads are fully compatible even within the same process",
 * to quote from pthread_create(3T).
 */

#include <thread.h>
#include <synch.h>

static mutex_t _solaris_atomic = DEFAULTMUTEX;

PRInt32
_MD_AtomicIncrement(PRInt32 *val)
{
    PRInt32 rv;
    if (mutex_lock(&_solaris_atomic) != 0)
        PR_ASSERT(0);

    rv = ++(*val);

    if (mutex_unlock(&_solaris_atomic) != 0)\
        PR_ASSERT(0);

	return rv;
}

PRInt32
_MD_AtomicAdd(PRInt32 *ptr, PRInt32 val)
{
    PRInt32 rv;
    if (mutex_lock(&_solaris_atomic) != 0)
        PR_ASSERT(0);

    rv = ((*ptr) += val);

    if (mutex_unlock(&_solaris_atomic) != 0)\
        PR_ASSERT(0);

	return rv;
}

PRInt32
_MD_AtomicDecrement(PRInt32 *val)
{
    PRInt32 rv;
    if (mutex_lock(&_solaris_atomic) != 0)
        PR_ASSERT(0);

    rv = --(*val);

    if (mutex_unlock(&_solaris_atomic) != 0)\
        PR_ASSERT(0);

	return rv;
}

PRInt32
_MD_AtomicSet(PRInt32 *val, PRInt32 newval)
{
    PRInt32 rv;
    if (mutex_lock(&_solaris_atomic) != 0)
        PR_ASSERT(0);

    rv = *val;
    *val = newval;

    if (mutex_unlock(&_solaris_atomic) != 0)\
        PR_ASSERT(0);

	return rv;
}
#endif  /* _PR_HAVE_ATOMIC_OPS */
#endif  /* !defined(i386) */

#if defined(_PR_GLOBAL_THREADS_ONLY)
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include <thread.h>

#include <sys/lwp.h>
#include <sys/procfs.h>
#include <sys/syscall.h>
extern int syscall();  /* not declared in sys/syscall.h */

static sigset_t old_mask;	/* store away original gc thread sigmask */
static PRIntn gcprio;		/* store away original gc thread priority */

THREAD_KEY_T threadid_key;
THREAD_KEY_T cpuid_key;
THREAD_KEY_T last_thread_key;
static sigset_t set, oldset;

void _MD_EarlyInit(void)
{
    THR_KEYCREATE(&threadid_key, NULL);
    THR_KEYCREATE(&cpuid_key, NULL);
    THR_KEYCREATE(&last_thread_key, NULL);
    sigemptyset(&set);
    sigaddset(&set, SIGALRM);
}

PRStatus _MD_CreateThread(PRThread *thread, 
					void (*start)(void *), 
					PRThreadPriority priority,
					PRThreadScope scope, 
					PRThreadState state, 
					PRUint32 stackSize) 
{
	PRInt32 flags;
	
    /* mask out SIGALRM for native thread creation */
    thr_sigsetmask(SIG_BLOCK, &set, &oldset); 

    /*
     * Note that we create joinable threads with the THR_DETACHED
     * flag.  The reasons why we don't use thr_join to implement
     * PR_JoinThread are:
     * - We use a termination condition variable in the PRThread
     *   structure to implement PR_JoinThread across all classic
     *   nspr implementation strategies.
     * - The native threads may be recycled by NSPR to run other
     *   new NSPR threads, so the native threads may not terminate
     *   when the corresponding NSPR threads terminate.  
     */
    flags = THR_SUSPENDED|THR_DETACHED;
    if (_PR_IS_GCABLE_THREAD(thread) || (thread->flags & _PR_BOUND_THREAD) ||
    							(scope == PR_GLOBAL_BOUND_THREAD))
		flags |= THR_BOUND;

    if (thr_create(NULL, thread->stack->stackSize,
                  (void *(*)(void *)) start, (void *) thread, 
				  flags,
                  &thread->md.handle)) {
        thr_sigsetmask(SIG_SETMASK, &oldset, NULL); 
        return PR_FAILURE;
    }

    /* When the thread starts running, then the lwpid is set to the right
     * value. Until then we want to mark this as 'uninit' so that
     * its register state is initialized properly for GC */

    thread->md.lwpid = -1;
    thr_sigsetmask(SIG_SETMASK, &oldset, NULL); 
    _MD_NEW_SEM(&thread->md.waiter_sem, 0);

    if ((scope == PR_GLOBAL_THREAD) || (scope == PR_GLOBAL_BOUND_THREAD)) {
		thread->flags |= _PR_GLOBAL_SCOPE;
    }

    _MD_SET_PRIORITY(&(thread->md), priority);

    /* Activate the thread */
    if (thr_continue( thread->md.handle ) ) {
	return PR_FAILURE;
    }
    return PR_SUCCESS;
}

void _MD_cleanup_thread(PRThread *thread)
{
    thread_t hdl;

    hdl = thread->md.handle;

    /* 
    ** First, suspend the thread (unless it's the active one)
    ** Because we suspend it first, we don't have to use LOCK_SCHEDULER to
    ** prevent both of us modifying the thread structure at the same time.
    */
    if ( thread != _PR_MD_CURRENT_THREAD() ) {
        thr_suspend(hdl);
    }
    PR_LOG(_pr_thread_lm, PR_LOG_MIN,
            ("(0X%x)[DestroyThread]\n", thread));

    _MD_DESTROY_SEM(&thread->md.waiter_sem);
}

void _MD_exit_thread(PRThread *thread)
{
    _MD_CLEAN_THREAD(thread);
    _MD_SET_CURRENT_THREAD(NULL);
}

void _MD_SET_PRIORITY(_MDThread *md_thread,
        PRThreadPriority newPri)
{
	PRIntn nativePri;

	if (newPri < PR_PRIORITY_FIRST) {
		newPri = PR_PRIORITY_FIRST;
	} else if (newPri > PR_PRIORITY_LAST) {
		newPri = PR_PRIORITY_LAST;
	}
	/* Solaris priorities are from 0 to 127 */
	nativePri = newPri * 127 / PR_PRIORITY_LAST;
	if(thr_setprio((thread_t)md_thread->handle, nativePri)) {
		PR_LOG(_pr_thread_lm, PR_LOG_MIN,
		   ("_PR_SetThreadPriority: can't set thread priority\n"));
	}
}

void _MD_WAIT_CV(
    struct _MDCVar *md_cv, struct _MDLock *md_lock, PRIntervalTime timeout)
{
    struct timespec tt;
    PRUint32 msec;
    PRThread *me = _PR_MD_CURRENT_THREAD();

	PR_ASSERT((!suspendAllOn) || (suspendAllThread != me));

    if (PR_INTERVAL_NO_TIMEOUT == timeout) {
        COND_WAIT(&md_cv->cv, &md_lock->lock);
    } else {
        msec = PR_IntervalToMilliseconds(timeout);

        GETTIME(&tt);
        tt.tv_sec += msec / PR_MSEC_PER_SEC;
        tt.tv_nsec += (msec % PR_MSEC_PER_SEC) * PR_NSEC_PER_MSEC;
        /* Check for nsec overflow - otherwise we'll get an EINVAL */
        if (tt.tv_nsec >= PR_NSEC_PER_SEC) {
            tt.tv_sec++;
            tt.tv_nsec -= PR_NSEC_PER_SEC;
        }
        COND_TIMEDWAIT(&md_cv->cv, &md_lock->lock, &tt);
    }
}

void _MD_lock(struct _MDLock *md_lock)
{
#ifdef DEBUG
    /* This code was used for GC testing to make sure that we didn't attempt
     * to grab any locks while threads are suspended.
     */
    PRLock *lock;
    
    if ((suspendAllOn) && (suspendAllThread == _PR_MD_CURRENT_THREAD())) {
        lock = ((PRLock *) ((char*) (md_lock) - offsetof(PRLock,ilock)));
	PR_ASSERT(lock->owner == NULL);
        return;
    }
#endif /* DEBUG */

    mutex_lock(&md_lock->lock);
}

PRThread *_pr_current_thread_tls()
{
    PRThread *ret;

    thr_getspecific(threadid_key, (void **)&ret);
    return ret;
}

PRStatus
_MD_wait(PRThread *thread, PRIntervalTime ticks)
{
        _MD_WAIT_SEM(&thread->md.waiter_sem);
        return PR_SUCCESS;
}

PRStatus
_MD_WakeupWaiter(PRThread *thread)
{
	if (thread == NULL) {
		return PR_SUCCESS;
	}
	_MD_POST_SEM(&thread->md.waiter_sem);
	return PR_SUCCESS;
}

_PRCPU *_pr_current_cpu_tls()
{
    _PRCPU *ret;

    thr_getspecific(cpuid_key, (void **)&ret);
    return ret;
}

PRThread *_pr_last_thread_tls()
{
    PRThread *ret;

    thr_getspecific(last_thread_key, (void **)&ret);
    return ret;
}

_MDLock _pr_ioq_lock;

void
_MD_InitIO(void)
{
    _MD_NEW_LOCK(&_pr_ioq_lock);
}

PRStatus _MD_InitializeThread(PRThread *thread)
{
    if (!_PR_IS_NATIVE_THREAD(thread))
        return PR_SUCCESS;
    /* sol_curthread is an asm routine which grabs GR7; GR7 stores an internal
     * thread structure ptr used by solaris.  We'll use this ptr later
     * with suspend/resume to find which threads are running on LWPs.
     */
    thread->md.threadID = sol_curthread();
		/* prime the sp; substract 4 so we don't hit the assert that
		 * curr sp > base_stack
		 */
    thread->md.sp = (uint_t) thread->stack->allocBase - sizeof(long);
    thread->md.lwpid = _lwp_self();
    thread->md.handle = THR_SELF();

	/* all threads on Solaris are global threads from NSPR's perspective
	 * since all of them are mapped to Solaris threads.
	 */
    thread->flags |= _PR_GLOBAL_SCOPE;
 
 	/* For primordial/attached thread, we don't create an underlying native thread.
 	 * So, _MD_CREATE_THREAD() does not get called.  We need to do initialization
 	 * like allocating thread's synchronization variables and set the underlying
 	 * native thread's priority.
 	 */
	if (thread->flags & (_PR_PRIMORDIAL | _PR_ATTACHED)) {
	    _MD_NEW_SEM(&thread->md.waiter_sem, 0);
	    _MD_SET_PRIORITY(&(thread->md), thread->priority);
	}
	return PR_SUCCESS;
}

/* Sleep for n milliseconds, n < 1000   */
void solaris_msec_sleep(int n)
{
    struct timespec ts;

    ts.tv_sec = 0;