solaris.c

Netscape NSPR库源码

    ts.tv_nsec = 1000000*n;
    if (syscall(SYS_nanosleep, &ts, 0, 0) < 0) {
        PR_ASSERT(0);
    }
}      

#define VALID_SP(sp, bottom, top)   \
	(((uint_t)(sp)) > ((uint_t)(bottom)) && ((uint_t)(sp)) < ((uint_t)(top)))

void solaris_record_regs(PRThread *t, prstatus_t *lwpstatus)
{
#ifdef sparc
	long *regs = (long *)&t->md.context.uc_mcontext.gregs[0];

	PR_ASSERT(_PR_IS_GCABLE_THREAD(t));
	PR_ASSERT(t->md.threadID == lwpstatus->pr_reg[REG_G7]);

	t->md.sp = lwpstatus->pr_reg[REG_SP];
	PR_ASSERT(VALID_SP(t->md.sp, t->stack->stackBottom, t->stack->stackTop));

	regs[0] = lwpstatus->pr_reg[R_G1];
	regs[1] = lwpstatus->pr_reg[R_G2];
	regs[2] = lwpstatus->pr_reg[R_G3];
	regs[3] = lwpstatus->pr_reg[R_G4];
	regs[4] = lwpstatus->pr_reg[R_O0];
	regs[5] = lwpstatus->pr_reg[R_O1];
	regs[6] = lwpstatus->pr_reg[R_O2];
	regs[7] = lwpstatus->pr_reg[R_O3];
	regs[8] = lwpstatus->pr_reg[R_O4];
	regs[9] = lwpstatus->pr_reg[R_O5];
	regs[10] = lwpstatus->pr_reg[R_O6];
	regs[11] = lwpstatus->pr_reg[R_O7];
#elif defined(i386)
	/*
	 * To be implemented and tested
	 */
	PR_ASSERT(0);
	PR_ASSERT(t->md.threadID == lwpstatus->pr_reg[GS]);
	t->md.sp = lwpstatus->pr_reg[UESP];
#endif
}   

void solaris_preempt_off()
{
    sigset_t set;
 
    (void)sigfillset(&set);
    syscall(SYS_sigprocmask, SIG_SETMASK, &set, &old_mask);
}

void solaris_preempt_on()
{
    syscall(SYS_sigprocmask, SIG_SETMASK, &old_mask, NULL);      
}

int solaris_open_main_proc_fd()
{
    char buf[30];
    int fd;

    /* Not locked, so must be created while threads coming up */
    PR_snprintf(buf, sizeof(buf), "/proc/%ld", getpid());
    if ( (fd = syscall(SYS_open, buf, O_RDONLY)) < 0) {
        return -1;
    }
    return fd;
}

/* Return a file descriptor for the /proc entry corresponding to the
 * given lwp. 
 */
int solaris_open_lwp(lwpid_t id, int lwp_main_proc_fd)
{
    int result;

    if ( (result = syscall(SYS_ioctl, lwp_main_proc_fd, PIOCOPENLWP, &id)) <0)
        return -1; /* exited??? */

    return result;
}
void _MD_Begin_SuspendAll()
{
    solaris_preempt_off();

    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin_SuspendAll\n"));
    /* run at highest prio so I cannot be preempted */
    thr_getprio(thr_self(), &gcprio);
    thr_setprio(thr_self(), 0x7fffffff); 
    suspendAllOn = PR_TRUE;
    suspendAllThread = _PR_MD_CURRENT_THREAD();
}

void _MD_End_SuspendAll()
{
}

void _MD_End_ResumeAll()
{
    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("End_ResumeAll\n"));
    thr_setprio(thr_self(), gcprio);
    solaris_preempt_on();
    suspendAllThread = NULL;
    suspendAllOn = PR_FALSE;
}

void _MD_Suspend(PRThread *thr)
{
   int lwp_fd, result;
   prstatus_t lwpstatus;
   int lwp_main_proc_fd = 0;
  
   if (!_PR_IS_GCABLE_THREAD(thr) || !suspendAllOn){
     /*XXX When the suspendAllOn is set, we will be trying to do lwp_suspend
      * during that time we can't call any thread lib or libc calls. Hence
      * make sure that no suspension is requested for Non gcable thread
      * during suspendAllOn */
      PR_ASSERT(!suspendAllOn);
      thr_suspend(thr->md.handle);
      return;
   }

    /* XXX Primordial thread can't be bound to an lwp, hence there is no
     * way we can assume that we can get the lwp status for primordial
     * thread reliably. Hence we skip this for primordial thread, hoping
     * that the SP is saved during lock and cond. wait. 
     * XXX - Again this is concern only for java interpreter, not for the
     * server, 'cause primordial thread in the server does not do java work
     */
    if (thr->flags & _PR_PRIMORDIAL)
      return;
    
    /* XXX Important Note: If the start function of a thread is not called,
     * lwpid is -1. Then, skip this thread. This thread will get caught
     * in PR_NativeRunThread before calling the start function, because
     * we hold the pr_activeLock during suspend/resume */

    /* if the thread is not started yet then don't do anything */
    if (!suspendAllOn || thr->md.lwpid == -1)
      return;

    if (_lwp_suspend(thr->md.lwpid) < 0) { 
       PR_ASSERT(0);
       return;
    }

    if ( (lwp_main_proc_fd = solaris_open_main_proc_fd()) < 0) {
        PR_ASSERT(0);
        return;   /* XXXMB ARGH, we're hosed! */
    }

   if ( (lwp_fd = solaris_open_lwp(thr->md.lwpid, lwp_main_proc_fd)) < 0) {
           PR_ASSERT(0);
           close(lwp_main_proc_fd);
	   return;
   }
   if ( (result = syscall(SYS_ioctl, lwp_fd, PIOCSTATUS, &lwpstatus)) < 0) {
            /* Hopefully the thread just died... */
           close(lwp_fd);
           close(lwp_main_proc_fd);
	   return;
   }
            while ( !(lwpstatus.pr_flags & PR_STOPPED) ) {
                if ( (result = syscall(SYS_ioctl, lwp_fd, PIOCSTATUS, &lwpstatus)) < 0) {
                    PR_ASSERT(0);  /* ARGH SOMETHING WRONG! */
                    break;
                }
                solaris_msec_sleep(1);
            }
            solaris_record_regs(thr, &lwpstatus);
            close(lwp_fd);
   close(lwp_main_proc_fd);
}

#ifdef OLD_CODE

void _MD_SuspendAll()
{
    /* On solaris there are threads, and there are LWPs. 
     * Calling _PR_DoSingleThread would freeze all of the threads bound to LWPs
     * but not necessarily stop all LWPs (for example if someone did
     * an attachthread of a thread which was not bound to an LWP).
     * So now go through all the LWPs for this process and freeze them.
     *
     * Note that if any thread which is capable of having the GC run on it must
     * had better be a LWP with a single bound thread on it.  Otherwise, this 
     * might not stop that thread from being run.
     */
    PRThread *current = _PR_MD_CURRENT_THREAD();
    prstatus_t status, lwpstatus;
    int result, index, lwp_fd;
    lwpid_t me = _lwp_self();
    int err;
    int lwp_main_proc_fd;

    solaris_preempt_off();

    /* run at highest prio so I cannot be preempted */
    thr_getprio(thr_self(), &gcprio);
    thr_setprio(thr_self(), 0x7fffffff); 

    current->md.sp = (uint_t)&me;	/* set my own stack pointer */

    if ( (lwp_main_proc_fd = solaris_open_main_proc_fd()) < 0) {
        PR_ASSERT(0);
        solaris_preempt_on();
        return;   /* XXXMB ARGH, we're hosed! */
    }

    if ( (result = syscall(SYS_ioctl, lwp_main_proc_fd, PIOCSTATUS, &status)) < 0) {
        err = errno;
        PR_ASSERT(0);
        goto failure;   /* XXXMB ARGH, we're hosed! */
    }

    num_lwps = status.pr_nlwp;

    if ( (all_lwps = (lwpid_t *)PR_MALLOC((num_lwps+1) * sizeof(lwpid_t)))==NULL) {
        PR_ASSERT(0);
        goto failure;   /* XXXMB ARGH, we're hosed! */
    }
           
    if ( (result = syscall(SYS_ioctl, lwp_main_proc_fd, PIOCLWPIDS, all_lwps)) < 0) {
        PR_ASSERT(0);
        PR_DELETE(all_lwps);
        goto failure;   /* XXXMB ARGH, we're hosed! */
    }

    for (index=0; index< num_lwps; index++) {
        if (all_lwps[index] != me)  {
            if (_lwp_suspend(all_lwps[index]) < 0) { 
                /* could happen if lwp exited */
                all_lwps[index] = me;	/* dummy it up */
            }
        }
    }

    /* Turns out that lwp_suspend is not a blocking call.
     * Go through the list and make sure they are all stopped.
     */
    for (index=0; index< num_lwps; index++) {
        if (all_lwps[index] != me)  {
            if ( (lwp_fd = solaris_open_lwp(all_lwps[index], lwp_main_proc_fd)) < 0) {
                PR_ASSERT(0);
                PR_DELETE(all_lwps);
                all_lwps = NULL;
                goto failure;   /* XXXMB ARGH, we're hosed! */
            }

            if ( (result = syscall(SYS_ioctl, lwp_fd, PIOCSTATUS, &lwpstatus)) < 0) {
                /* Hopefully the thread just died... */
                close(lwp_fd);
                continue;
            }
            while ( !(lwpstatus.pr_flags & PR_STOPPED) ) {
                if ( (result = syscall(SYS_ioctl, lwp_fd, PIOCSTATUS, &lwpstatus)) < 0) {
                    PR_ASSERT(0);  /* ARGH SOMETHING WRONG! */
                    break;
                }
                solaris_msec_sleep(1);
            }
            solaris_record_regs(&lwpstatus);
            close(lwp_fd);
        }
    }

    close(lwp_main_proc_fd);

    return;
failure:
    solaris_preempt_on();
    thr_setprio(thr_self(), gcprio);
    close(lwp_main_proc_fd);
    return;
}

void _MD_ResumeAll()
{
    int i;
    lwpid_t me = _lwp_self();
 
    for (i=0; i < num_lwps; i++) {
        if (all_lwps[i] == me)
            continue;
        if ( _lwp_continue(all_lwps[i]) < 0) {
            PR_ASSERT(0);  /* ARGH, we are hosed! */
        }
    }

    /* restore priority and sigmask */
    thr_setprio(thr_self(), gcprio);
    solaris_preempt_on();
    PR_DELETE(all_lwps);
    all_lwps = NULL;
}
#endif /* OLD_CODE */

#ifdef USE_SETJMP
PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
{
    if (isCurrent) {
		(void) setjmp(CONTEXT(t));
    }
    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
    return (PRWord *) CONTEXT(t);
}
#else
PRWord *_MD_HomeGCRegisters(PRThread *t, PRIntn isCurrent, PRIntn *np)
{
    if (isCurrent) {
		(void) getcontext(CONTEXT(t));
    }
    *np = NGREG;
    return (PRWord*) &t->md.context.uc_mcontext.gregs[0];
}
#endif  /* USE_SETJMP */

#else /* _PR_GLOBAL_THREADS_ONLY */

#if defined(_PR_LOCAL_THREADS_ONLY)

void _MD_EarlyInit(void)
{
}

void _MD_SolarisInit()
{
    _PR_UnixInit();
}

void
_MD_SET_PRIORITY(_MDThread *thread, PRThreadPriority newPri)
{
    return;
}

PRStatus
_MD_InitializeThread(PRThread *thread)
{
	return PR_SUCCESS;
}

PRStatus
_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
{
    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
    _PR_MD_SWITCH_CONTEXT(thread);
    return PR_SUCCESS;
}

PRStatus
_MD_WAKEUP_WAITER(PRThread *thread)
{
	PR_ASSERT((thread == NULL) || (!(thread->flags & _PR_GLOBAL_SCOPE)));
    return PR_SUCCESS;
}

/* These functions should not be called for Solaris */
void
_MD_YIELD(void)
{
    PR_NOT_REACHED("_MD_YIELD should not be called for Solaris");
}

PRStatus
_MD_CREATE_THREAD(
    PRThread *thread,
    void (*start) (void *),
    PRThreadPriority priority,
    PRThreadScope scope,
    PRThreadState state,
    PRUint32 stackSize)
{
    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for Solaris");
	return(PR_FAILURE);
}

#ifdef USE_SETJMP
PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
{
    if (isCurrent) {
		(void) setjmp(CONTEXT(t));
    }
    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
    return (PRWord *) CONTEXT(t);
}
#else
PRWord *_MD_HomeGCRegisters(PRThread *t, PRIntn isCurrent, PRIntn *np)
{
    if (isCurrent) {
		(void) getcontext(CONTEXT(t));
    }
    *np = NGREG;
    return (PRWord*) &t->md.context.uc_mcontext.gregs[0];
}
#endif  /* USE_SETJMP */

#endif  /* _PR_LOCAL_THREADS_ONLY */

#endif /* _PR_GLOBAL_THREADS_ONLY */

#ifndef _PR_PTHREADS
#if defined(i386) && defined(SOLARIS2_4)
/* 
 * Because clock_gettime() on Solaris/x86 2.4 always generates a
 * segmentation fault, we use an emulated version _pr_solx86_clock_gettime(),
 * which is implemented using gettimeofday().
 */

int
_pr_solx86_clock_gettime(clockid_t clock_id, struct timespec *tp)
{
    struct timeval tv;

    if (clock_id != CLOCK_REALTIME) {
	errno = EINVAL;
	return -1;
    }

    gettimeofday(&tv, NULL);
    tp->tv_sec = tv.tv_sec;
    tp->tv_nsec = tv.tv_usec * 1000;
    return 0;
}
#endif  /* i386 && SOLARIS2_4 */
#endif  /* _PR_PTHREADS */