The Tor Browser: nsprpub/pr/src/md/os2/os2thred.c@6474c204b198 (annotated)

nsprpub/pr/src/md/os2/os2thred.c@6474c204b198 (annotated)

nsprpub/pr/src/md/os2/os2thred.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "primpl.h"
 #include <process.h>  /* for _beginthread() */
 #include <signal.h>
 #include <float.h>
 /* --- globals ------------------------------------------------ */
 _NSPR_TLS*        pThreadLocalStorage = 0;
 _PRInterruptTable             _pr_interruptTable[] = { { 0 } };
 APIRET (* APIENTRY QueryThreadContext)(TID, ULONG, PCONTEXTRECORD);
 void
 _PR_MD_ENSURE_TLS(void)
 {
    if(!pThreadLocalStorage)
    {
       /* Allocate thread local storage (TLS).  Note, that only 32 bytes can
        * be allocated at a time.
        */
       int rc = DosAllocThreadLocalMemory(sizeof(_NSPR_TLS) / 4, (PULONG*)&pThreadLocalStorage);
       PR_ASSERT(rc == NO_ERROR);
       memset(pThreadLocalStorage, 0, sizeof(_NSPR_TLS));
    }
 }
 void
 _PR_MD_EARLY_INIT()
 {
    HMODULE hmod;
    if (DosLoadModule(NULL, 0, "DOSCALL1", &hmod) == 0)
        DosQueryProcAddr(hmod, 877, "DOSQUERYTHREADCONTEXT",
                         (PFN *)&QueryThreadContext);
 }
 static void
 _pr_SetThreadMDHandle(PRThread *thread)
 {
    PTIB ptib;
    PPIB ppib;
    PRUword rc;
    rc = DosGetInfoBlocks(&ptib, &ppib);
    thread->md.handle = ptib->tib_ptib2->tib2_ultid;
 }
 /* On OS/2, some system function calls seem to change the FPU control word,
  * such that we crash with a floating underflow exception.  The FIX_FPU() call
  * in jsnum.c does not always work, as sometimes FIX_FPU() is called BEFORE the
  * OS/2 system call that horks the FPU control word.  So, we set an exception
  * handler that covers any floating point exceptions and resets the FPU CW to
  * the required value.
  */
 static ULONG
 _System OS2_FloatExcpHandler(PEXCEPTIONREPORTRECORD p1,
                              PEXCEPTIONREGISTRATIONRECORD p2,
                              PCONTEXTRECORD p3,
                              PVOID pv)
 {
 #ifdef DEBUG_pedemonte
     printf("Entering exception handler; ExceptionNum = %x\n", p1->ExceptionNum);
     switch(p1->ExceptionNum) {
         case XCPT_FLOAT_DENORMAL_OPERAND:
             printf("got XCPT_FLOAT_DENORMAL_OPERAND\n");
             break;
         case XCPT_FLOAT_DIVIDE_BY_ZERO:
             printf("got XCPT_FLOAT_DIVIDE_BY_ZERO\n");
             break;
         case XCPT_FLOAT_INEXACT_RESULT:
             printf("got XCPT_FLOAT_INEXACT_RESULT\n");
             break;
         case XCPT_FLOAT_INVALID_OPERATION:
             printf("got XCPT_FLOAT_INVALID_OPERATION\n");
             break;
         case XCPT_FLOAT_OVERFLOW:
             printf("got XCPT_FLOAT_OVERFLOW\n");
             break;
         case XCPT_FLOAT_STACK_CHECK:
             printf("got XCPT_FLOAT_STACK_CHECK\n");
             break;
         case XCPT_FLOAT_UNDERFLOW:
             printf("got XCPT_FLOAT_UNDERFLOW\n");
             break;
     }
 #endif
     switch(p1->ExceptionNum) {
         case XCPT_FLOAT_DENORMAL_OPERAND:
         case XCPT_FLOAT_DIVIDE_BY_ZERO:
         case XCPT_FLOAT_INEXACT_RESULT:
         case XCPT_FLOAT_INVALID_OPERATION:
         case XCPT_FLOAT_OVERFLOW:
         case XCPT_FLOAT_STACK_CHECK:
         case XCPT_FLOAT_UNDERFLOW:
         {
             unsigned cw = p3->ctx_env[0];
             if ((cw & MCW_EM) != MCW_EM) {
                 /* Mask out all floating point exceptions */
                 p3->ctx_env[0] |= MCW_EM;
                 /* Following two lines set precision to 53 bit mantissa.  See jsnum.c */
                 p3->ctx_env[0] &= ~MCW_PC;
                 p3->ctx_env[0] |= PC_53;
                 return XCPT_CONTINUE_EXECUTION;
             }
         }
     }
     return XCPT_CONTINUE_SEARCH;
 }
 PR_IMPLEMENT(void)
 PR_OS2_SetFloatExcpHandler(EXCEPTIONREGISTRATIONRECORD* excpreg)
 {
     /* setup the exception handler for the thread */
     APIRET rv;
     excpreg->ExceptionHandler = OS2_FloatExcpHandler;
     excpreg->prev_structure = NULL;
     rv = DosSetExceptionHandler(excpreg);
     PR_ASSERT(rv == NO_ERROR);
 }
 PR_IMPLEMENT(void)
 PR_OS2_UnsetFloatExcpHandler(EXCEPTIONREGISTRATIONRECORD* excpreg)
 {
     /* unset exception handler */
     APIRET rv = DosUnsetExceptionHandler(excpreg);
     PR_ASSERT(rv == NO_ERROR);
 }
 PRStatus
 _PR_MD_INIT_THREAD(PRThread *thread)
 {
    APIRET rv;
    if (thread->flags & (_PR_PRIMORDIAL | _PR_ATTACHED)) {
       _pr_SetThreadMDHandle(thread);
    }
    /* Create the blocking IO semaphore */
    rv = DosCreateEventSem(NULL, &(thread->md.blocked_sema), 0, 0);
    return (rv == NO_ERROR) ? PR_SUCCESS : PR_FAILURE;
 }
 typedef struct param_store
 {
     void (*start)(void *);
     PRThread* thread;
 } PARAMSTORE;
 /* This is a small intermediate function that sets/unsets the exception
    handler before calling the initial thread function */
 static void
 ExcpStartFunc(void* arg)
 {
     EXCEPTIONREGISTRATIONRECORD excpreg;
     PARAMSTORE params, *pParams = arg;
     PR_OS2_SetFloatExcpHandler(&excpreg);
     params = *pParams;
     PR_Free(pParams);
     params.start(params.thread);
     PR_OS2_UnsetFloatExcpHandler(&excpreg);
 }
 PRStatus
 _PR_MD_CREATE_THREAD(PRThread *thread,
                   void (*start)(void *),
                   PRThreadPriority priority,
                   PRThreadScope scope,
                   PRThreadState state,
                   PRUint32 stackSize)
 {
     PARAMSTORE* params = PR_Malloc(sizeof(PARAMSTORE));
     params->start = start;
     params->thread = thread;
     thread->md.handle = thread->id = (TID) _beginthread(ExcpStartFunc,
                                                         NULL,
                                                         thread->stack->stackSize,
                                                         params);
     if(thread->md.handle == -1) {
         return PR_FAILURE;
     }
     /*
      * On OS/2, a thread is created with a thread priority of
      * THREAD_PRIORITY_NORMAL
      */
     if (priority != PR_PRIORITY_NORMAL) {
         _PR_MD_SET_PRIORITY(&(thread->md), priority);
     }
     return PR_SUCCESS;
 }
 void
 _PR_MD_YIELD(void)
 {
     /* Isn't there some problem with DosSleep(0) on OS/2? */
     DosSleep(0);
 }
 void
 _PR_MD_SET_PRIORITY(_MDThread *thread, PRThreadPriority newPri)
 {
     int nativePri = PRTYC_NOCHANGE;
     BOOL rv;
     if (newPri < PR_PRIORITY_FIRST) {
         newPri = PR_PRIORITY_FIRST;
     } else if (newPri > PR_PRIORITY_LAST) {
         newPri = PR_PRIORITY_LAST;
     }
     switch (newPri) {
         case PR_PRIORITY_LOW:
         case PR_PRIORITY_NORMAL:
             nativePri = PRTYC_REGULAR;
             break;
         case PR_PRIORITY_HIGH:
             nativePri = PRTYC_FOREGROUNDSERVER;
             break;
         case PR_PRIORITY_URGENT:
             nativePri = PRTYC_TIMECRITICAL;
     }
     rv = DosSetPriority(PRTYS_THREAD, nativePri, 0, thread->handle);
     PR_ASSERT(rv == NO_ERROR);
     if (rv != NO_ERROR) {
         PR_LOG(_pr_thread_lm, PR_LOG_MIN,
                 ("PR_SetThreadPriority: can't set thread priority\n"));
     }
     return;
 }
 void
 _PR_MD_CLEAN_THREAD(PRThread *thread)
 {
     APIRET rv;
     if (thread->md.blocked_sema) {
         rv = DosCloseEventSem(thread->md.blocked_sema);
         PR_ASSERT(rv == NO_ERROR);
         thread->md.blocked_sema = 0;
     }
     if (thread->md.handle) {
         thread->md.handle = 0;
     }
 }
 void
 _PR_MD_EXIT_THREAD(PRThread *thread)
 {
     _PR_MD_CLEAN_THREAD(thread);
     _PR_MD_SET_CURRENT_THREAD(NULL);
 }
 void
 _PR_MD_EXIT(PRIntn status)
 {
     _exit(status);
 }
 #ifdef HAVE_THREAD_AFFINITY
 PR_EXTERN(PRInt32)
 _PR_MD_SETTHREADAFFINITYMASK(PRThread *thread, PRUint32 mask )
 {
    /* Can we do this on OS/2?  Only on SMP versions? */
    PR_ASSERT(!"Not implemented");
    return 0;
  /* This is what windows does:
     int rv;
     rv = SetThreadAffinityMask(thread->md.handle, mask);
     return rv?0:-1;
   */
 }
 PR_EXTERN(PRInt32)
 _PR_MD_GETTHREADAFFINITYMASK(PRThread *thread, PRUint32 *mask)
 {
    /* Can we do this on OS/2?  Only on SMP versions? */
    PR_ASSERT(!"Not implemented");
    return 0;
  /* This is what windows does:
     PRInt32 rv, system_mask;
     rv = GetProcessAffinityMask(GetCurrentProcess(), mask, &system_mask);
     return rv?0:-1;
   */
 }
 #endif /* HAVE_THREAD_AFFINITY */
 void
 _PR_MD_SUSPEND_CPU(_PRCPU *cpu)
 {
     _PR_MD_SUSPEND_THREAD(cpu->thread);
 }
 void
 _PR_MD_RESUME_CPU(_PRCPU *cpu)
 {
     _PR_MD_RESUME_THREAD(cpu->thread);
 }
 void
 _PR_MD_SUSPEND_THREAD(PRThread *thread)
 {
     if (_PR_IS_NATIVE_THREAD(thread)) {
        APIRET rc;
         /* XXXMB - DosSuspendThread() is not a blocking call; how do we
          * know when the thread is *REALLY* suspended?
          */
        rc = DosSuspendThread(thread->md.handle);
        PR_ASSERT(rc == NO_ERROR);
     }
 }
 void
 _PR_MD_RESUME_THREAD(PRThread *thread)
 {
     if (_PR_IS_NATIVE_THREAD(thread)) {
         DosResumeThread(thread->md.handle);
     }
 }
 PRThread*
 _MD_CURRENT_THREAD(void)
 {
     PRThread *thread;
     thread = _MD_GET_ATTACHED_THREAD();
     if (NULL == thread) {
         thread = _PRI_AttachThread(PR_USER_THREAD, PR_PRIORITY_NORMAL, NULL, 0);
     }
     PR_ASSERT(thread != NULL);
     return thread;
 }

The Tor Browser / annotate

nsprpub/pr/src/md/os2/os2thred.c@6474c204b198 (annotated)

nsprpub/pr/src/md/os2/os2thred.c