diff options
Diffstat (limited to 'nsprpub/pr/src/md/os2/os2thred.c')
| -rw-r--r-- | nsprpub/pr/src/md/os2/os2thred.c | 353 |
1 files changed, 353 insertions, 0 deletions
diff --git a/nsprpub/pr/src/md/os2/os2thred.c b/nsprpub/pr/src/md/os2/os2thred.c new file mode 100644 index 000000000..edb9f5f0c --- /dev/null +++ b/nsprpub/pr/src/md/os2/os2thred.c @@ -0,0 +1,353 @@ +/* -*- 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_NOT_REACHED("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_NOT_REACHED("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; +} + |