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-rw-r--r--nsprpub/pr/src/md/os2/os2thred.c353
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;
+}
+