--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nspr/pr/src/threads/combined/prucpu.c	Mon Jul 28 10:47:06 2014 +0200
@@ -0,0 +1,405 @@
+/* -*- 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"
+
+_PRCPU *_pr_primordialCPU = NULL;
+
+PRInt32 _pr_md_idle_cpus;       /* number of idle cpus */
+/*
+ * The idle threads in MxN models increment/decrement _pr_md_idle_cpus.
+ * If _PR_HAVE_ATOMIC_OPS is not defined, they can't use the atomic
+ * increment/decrement routines (which are based on PR_Lock/PR_Unlock),
+ * because PR_Lock asserts that the calling thread is not an idle thread.
+ * So we use a _MDLock to protect _pr_md_idle_cpus.
+ */
+#if !defined(_PR_LOCAL_THREADS_ONLY) && !defined(_PR_GLOBAL_THREADS_ONLY)
+#ifndef _PR_HAVE_ATOMIC_OPS
+static _MDLock _pr_md_idle_cpus_lock;
+#endif
+#endif
+PRUintn _pr_numCPU;
+PRInt32 _pr_cpus_exit;
+PRUint32 _pr_cpu_affinity_mask = 0;
+
+#if !defined (_PR_GLOBAL_THREADS_ONLY)
+
+static PRUintn _pr_cpuID;
+
+static void PR_CALLBACK _PR_CPU_Idle(void *);
+
+static _PRCPU *_PR_CreateCPU(void);
+static PRStatus _PR_StartCPU(_PRCPU *cpu, PRThread *thread);
+
+#if !defined(_PR_LOCAL_THREADS_ONLY)
+static void _PR_RunCPU(void *arg);
+#endif
+
+void  _PR_InitCPUs()
+{
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    if (_native_threads_only)
+        return;
+
+    _pr_cpuID = 0;
+    _MD_NEW_LOCK( &_pr_cpuLock);
+#if !defined(_PR_LOCAL_THREADS_ONLY) && !defined(_PR_GLOBAL_THREADS_ONLY)
+#ifndef _PR_HAVE_ATOMIC_OPS
+    _MD_NEW_LOCK(&_pr_md_idle_cpus_lock);
+#endif
+#endif
+
+#ifdef _PR_LOCAL_THREADS_ONLY
+
+#ifdef HAVE_CUSTOM_USER_THREADS
+    _PR_MD_CREATE_PRIMORDIAL_USER_THREAD(me);
+#endif
+
+    /* Now start the first CPU. */
+    _pr_primordialCPU = _PR_CreateCPU();
+    _pr_numCPU = 1;
+    _PR_StartCPU(_pr_primordialCPU, me);
+
+    _PR_MD_SET_CURRENT_CPU(_pr_primordialCPU);
+
+    /* Initialize cpu for current thread (could be different from me) */
+    _PR_MD_CURRENT_THREAD()->cpu = _pr_primordialCPU;
+
+    _PR_MD_SET_LAST_THREAD(me);
+
+#else /* Combined MxN model */
+
+    _pr_primordialCPU = _PR_CreateCPU();
+    _pr_numCPU = 1;
+    _PR_CreateThread(PR_SYSTEM_THREAD,
+                     _PR_RunCPU,
+                     _pr_primordialCPU,
+                     PR_PRIORITY_NORMAL,
+                     PR_GLOBAL_THREAD,
+                     PR_UNJOINABLE_THREAD,
+                     0,
+                     _PR_IDLE_THREAD);
+
+#endif /* _PR_LOCAL_THREADS_ONLY */
+
+    _PR_MD_INIT_CPUS();
+}
+
+#ifdef WINNT
+/*
+ * Right now this function merely stops the CPUs and does
+ * not do any other cleanup.
+ *
+ * It is only implemented for WINNT because bug 161998 only
+ * affects the WINNT version of NSPR, but it would be nice
+ * to implement this function for other platforms too.
+ */
+void _PR_CleanupCPUs(void)
+{
+    PRUintn i;
+    PRCList *qp;
+    _PRCPU *cpu;
+
+    _pr_cpus_exit = 1;
+    for (i = 0; i < _pr_numCPU; i++) {
+        _PR_MD_WAKEUP_WAITER(NULL);
+    }
+    for (qp = _PR_CPUQ().next; qp != &_PR_CPUQ(); qp = qp->next) {
+        cpu = _PR_CPU_PTR(qp);
+        _PR_MD_JOIN_THREAD(&cpu->thread->md);
+    }
+}
+#endif
+
+static _PRCPUQueue *_PR_CreateCPUQueue(void)
+{
+    PRInt32 index;
+    _PRCPUQueue *cpuQueue;
+    cpuQueue = PR_NEWZAP(_PRCPUQueue);
+ 
+    _MD_NEW_LOCK( &cpuQueue->runQLock );
+    _MD_NEW_LOCK( &cpuQueue->sleepQLock );
+    _MD_NEW_LOCK( &cpuQueue->miscQLock );
+
+    for (index = 0; index < PR_PRIORITY_LAST + 1; index++)
+        PR_INIT_CLIST( &(cpuQueue->runQ[index]) );
+    PR_INIT_CLIST( &(cpuQueue->sleepQ) );
+    PR_INIT_CLIST( &(cpuQueue->pauseQ) );
+    PR_INIT_CLIST( &(cpuQueue->suspendQ) );
+    PR_INIT_CLIST( &(cpuQueue->waitingToJoinQ) );
+
+    cpuQueue->numCPUs = 1;
+
+    return cpuQueue;
+}
+
+/*
+ * Create a new CPU.
+ *
+ * This function initializes enough of the _PRCPU structure so
+ * that it can be accessed safely by a global thread or another
+ * CPU.  This function does not create the native thread that
+ * will run the CPU nor does it initialize the parts of _PRCPU
+ * that must be initialized by that native thread.
+ *
+ * The reason we cannot simply have the native thread create
+ * and fully initialize a new CPU is that we need to be able to
+ * create a usable _pr_primordialCPU in _PR_InitCPUs without
+ * assuming that the primordial CPU thread we created can run
+ * during NSPR initialization.  For example, on Windows while
+ * new threads can be created by DllMain, they won't be able
+ * to run during DLL initialization.  If NSPR is initialized
+ * by DllMain, the primordial CPU thread won't run until DLL
+ * initialization is finished.
+ */
+static _PRCPU *_PR_CreateCPU(void)
+{
+    _PRCPU *cpu;
+
+    cpu = PR_NEWZAP(_PRCPU);
+    if (cpu) {
+        cpu->queue = _PR_CreateCPUQueue();
+        if (!cpu->queue) {
+            PR_DELETE(cpu);
+            return NULL;
+        }
+    }
+    return cpu;
+}
+
+/*
+ * Start a new CPU.
+ *
+ * 'cpu' is a _PRCPU structure created by _PR_CreateCPU().
+ * 'thread' is the native thread that will run the CPU.
+ *
+ * If this function fails, 'cpu' is destroyed.
+ */
+static PRStatus _PR_StartCPU(_PRCPU *cpu, PRThread *thread)
+{
+    /*
+    ** Start a new cpu. The assumption this code makes is that the
+    ** underlying operating system creates a stack to go with the new
+    ** native thread. That stack will be used by the cpu when pausing.
+    */
+
+    PR_ASSERT(!_native_threads_only);
+
+    cpu->last_clock = PR_IntervalNow();
+
+    /* Before we create any threads on this CPU we have to
+     * set the current CPU 
+     */
+    _PR_MD_SET_CURRENT_CPU(cpu);
+    _PR_MD_INIT_RUNNING_CPU(cpu);
+    thread->cpu = cpu;
+
+    cpu->idle_thread = _PR_CreateThread(PR_SYSTEM_THREAD,
+                                        _PR_CPU_Idle,
+                                        (void *)cpu,
+                                        PR_PRIORITY_NORMAL,
+                                        PR_LOCAL_THREAD,
+                                        PR_UNJOINABLE_THREAD,
+                                        0,
+                                        _PR_IDLE_THREAD);
+
+    if (!cpu->idle_thread) {
+        /* didn't clean up CPU queue XXXMB */
+        PR_DELETE(cpu);
+        return PR_FAILURE;
+    } 
+    PR_ASSERT(cpu->idle_thread->cpu == cpu);
+
+    cpu->idle_thread->no_sched = 0;
+
+    cpu->thread = thread;
+
+    if (_pr_cpu_affinity_mask)
+        PR_SetThreadAffinityMask(thread, _pr_cpu_affinity_mask);
+
+    /* Created and started a new CPU */
+    _PR_CPU_LIST_LOCK();
+    cpu->id = _pr_cpuID++;
+    PR_APPEND_LINK(&cpu->links, &_PR_CPUQ());
+    _PR_CPU_LIST_UNLOCK();
+
+    return PR_SUCCESS;
+}
+
+#if !defined(_PR_GLOBAL_THREADS_ONLY) && !defined(_PR_LOCAL_THREADS_ONLY)
+/*
+** This code is used during a cpu's initial creation.
+*/
+static void _PR_RunCPU(void *arg)
+{
+    _PRCPU *cpu = (_PRCPU *)arg;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    PR_ASSERT(NULL != me);
+
+    /*
+     * _PR_StartCPU calls _PR_CreateThread to create the
+     * idle thread.  Because _PR_CreateThread calls PR_Lock,
+     * the current thread has to remain a global thread
+     * during the _PR_StartCPU call so that it can wait for
+     * the lock if the lock is held by another thread.  If
+     * we clear the _PR_GLOBAL_SCOPE flag in
+     * _PR_MD_CREATE_PRIMORDIAL_THREAD, the current thread
+     * will be treated as a local thread and have trouble
+     * waiting for the lock because the CPU is not fully
+     * constructed yet.
+     *
+     * After the CPU is started, it is safe to mark the
+     * current thread as a local thread.
+     */
+
+#ifdef HAVE_CUSTOM_USER_THREADS
+    _PR_MD_CREATE_PRIMORDIAL_USER_THREAD(me);
+#endif
+
+    me->no_sched = 1;
+    _PR_StartCPU(cpu, me);
+
+#ifdef HAVE_CUSTOM_USER_THREADS
+    me->flags &= (~_PR_GLOBAL_SCOPE);
+#endif
+
+    _PR_MD_SET_CURRENT_CPU(cpu);
+    _PR_MD_SET_CURRENT_THREAD(cpu->thread);
+    me->cpu = cpu;
+
+    while(1) {
+        PRInt32 is;
+        if (!_PR_IS_NATIVE_THREAD(me)) _PR_INTSOFF(is);
+	    _PR_MD_START_INTERRUPTS();
+        _PR_MD_SWITCH_CONTEXT(me);
+    }
+}
+#endif
+
+static void PR_CALLBACK _PR_CPU_Idle(void *_cpu)
+{
+    _PRCPU *cpu = (_PRCPU *)_cpu;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    PR_ASSERT(NULL != me);
+
+    me->cpu = cpu;
+    cpu->idle_thread = me;
+    if (_MD_LAST_THREAD())
+        _MD_LAST_THREAD()->no_sched = 0;
+    if (!_PR_IS_NATIVE_THREAD(me)) _PR_MD_SET_INTSOFF(0);
+    while(1) {
+        PRInt32 is;
+        PRIntervalTime timeout;
+        if (!_PR_IS_NATIVE_THREAD(me)) _PR_INTSOFF(is);
+
+        _PR_RUNQ_LOCK(cpu);
+#if !defined(_PR_LOCAL_THREADS_ONLY) && !defined(_PR_GLOBAL_THREADS_ONLY)
+#ifdef _PR_HAVE_ATOMIC_OPS
+        _PR_MD_ATOMIC_INCREMENT(&_pr_md_idle_cpus);
+#else
+        _PR_MD_LOCK(&_pr_md_idle_cpus_lock);
+        _pr_md_idle_cpus++;
+        _PR_MD_UNLOCK(&_pr_md_idle_cpus_lock);
+#endif /* _PR_HAVE_ATOMIC_OPS */
+#endif
+        /* If someone on runq; do a nonblocking PAUSECPU */
+        if (_PR_RUNQREADYMASK(me->cpu) != 0) {
+            _PR_RUNQ_UNLOCK(cpu);
+            timeout = PR_INTERVAL_NO_WAIT;
+        } else {
+            _PR_RUNQ_UNLOCK(cpu);
+
+            _PR_SLEEPQ_LOCK(cpu);
+            if (PR_CLIST_IS_EMPTY(&_PR_SLEEPQ(me->cpu))) {
+                timeout = PR_INTERVAL_NO_TIMEOUT;
+            } else {
+                PRThread *wakeThread;
+                wakeThread = _PR_THREAD_PTR(_PR_SLEEPQ(me->cpu).next);
+                timeout = wakeThread->sleep;
+            }
+            _PR_SLEEPQ_UNLOCK(cpu);
+        }
+
+        /* Wait for an IO to complete */
+        (void)_PR_MD_PAUSE_CPU(timeout);
+
+#ifdef WINNT
+        if (_pr_cpus_exit) {
+            /* _PR_CleanupCPUs tells us to exit */
+            _PR_MD_END_THREAD();
+        }
+#endif
+
+#if !defined(_PR_LOCAL_THREADS_ONLY) && !defined(_PR_GLOBAL_THREADS_ONLY)
+#ifdef _PR_HAVE_ATOMIC_OPS
+        _PR_MD_ATOMIC_DECREMENT(&_pr_md_idle_cpus);
+#else
+        _PR_MD_LOCK(&_pr_md_idle_cpus_lock);
+        _pr_md_idle_cpus--;
+        _PR_MD_UNLOCK(&_pr_md_idle_cpus_lock);
+#endif /* _PR_HAVE_ATOMIC_OPS */
+#endif
+
+		_PR_ClockInterrupt();
+
+		/* Now schedule any thread that is on the runq
+		 * INTS must be OFF when calling PR_Schedule()
+		 */
+		me->state = _PR_RUNNABLE;
+		_PR_MD_SWITCH_CONTEXT(me);
+		if (!_PR_IS_NATIVE_THREAD(me)) _PR_FAST_INTSON(is);
+    }
+}
+#endif /* _PR_GLOBAL_THREADS_ONLY */
+
+PR_IMPLEMENT(void) PR_SetConcurrency(PRUintn numCPUs)
+{
+#if defined(_PR_GLOBAL_THREADS_ONLY) || defined(_PR_LOCAL_THREADS_ONLY)
+
+    /* do nothing */
+
+#else /* combined, MxN thread model */
+
+    PRUintn newCPU;
+    _PRCPU *cpu;
+    PRThread *thr;
+
+
+    if (!_pr_initialized) _PR_ImplicitInitialization();
+
+	if (_native_threads_only)
+		return;
+    
+    _PR_CPU_LIST_LOCK();
+    if (_pr_numCPU < numCPUs) {
+        newCPU = numCPUs - _pr_numCPU;
+        _pr_numCPU = numCPUs;
+    } else newCPU = 0;
+    _PR_CPU_LIST_UNLOCK();
+
+    for (; newCPU; newCPU--) {
+        cpu = _PR_CreateCPU();
+        thr = _PR_CreateThread(PR_SYSTEM_THREAD,
+                              _PR_RunCPU,
+                              cpu,
+                              PR_PRIORITY_NORMAL,
+                              PR_GLOBAL_THREAD,
+                              PR_UNJOINABLE_THREAD,
+                              0,
+                              _PR_IDLE_THREAD);
+    }
+#endif
+}
+
+PR_IMPLEMENT(_PRCPU *) _PR_GetPrimordialCPU(void)
+{
+    if (_pr_primordialCPU)
+        return _pr_primordialCPU;
+    else
+        return _PR_MD_CURRENT_CPU();
+}