Delete bundled copy of NSS and replace with README.

nspr/pr/src/md/windows/w95cv.c

Index: nspr/pr/src/md/windows/w95cv.c
diff --git a/nspr/pr/src/md/windows/w95cv.c b/nspr/pr/src/md/windows/w95cv.c
deleted file mode 100644
index 27b34e6916058ff18ed8c465cb4861c2fe6fd856..0000000000000000000000000000000000000000
--- a/nspr/pr/src/md/windows/w95cv.c
+++ /dev/null
@@ -1,367 +0,0 @@
-/* -*- 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/. */
-
-/*
- *  w95cv.c -- Windows 95 Machine-Dependent Code for Condition Variables
- *
- *  We implement our own condition variable wait queue.  Each thread
- *  has a semaphore object (thread->md.blocked_sema) to block on while
- *  waiting on a condition variable.
- *
- *  We use a deferred condition notify algorithm.  When PR_NotifyCondVar
- *  or PR_NotifyAllCondVar is called, the condition notifies are simply
- *  recorded in the _MDLock structure.  We defer the condition notifies
- *  until right after we unlock the lock.  This way the awakened threads
- *  have a better chance to reaquire the lock.
- */
- 
-#include "primpl.h"
-
-/*
- * AddThreadToCVWaitQueueInternal --
- *
- * Add the thread to the end of the condition variable's wait queue.
- * The CV's lock must be locked when this function is called.
- */
-
-static void
-AddThreadToCVWaitQueueInternal(PRThread *thred, struct _MDCVar *cv)
-{
-    PR_ASSERT((cv->waitTail != NULL && cv->waitHead != NULL)
-            || (cv->waitTail == NULL && cv->waitHead == NULL));
-    cv->nwait += 1;
-    thred->md.inCVWaitQueue = PR_TRUE;
-    thred->md.next = NULL;
-    thred->md.prev = cv->waitTail;
-    if (cv->waitHead == NULL) {
-        cv->waitHead = thred;
-    } else {
-        cv->waitTail->md.next = thred;
-    }
-    cv->waitTail = thred;
-}
-
-/*
- * md_UnlockAndPostNotifies --
- *
- * Unlock the lock, and then do the deferred condition notifies.
- * If waitThred and waitCV are not NULL, waitThred is added to
- * the wait queue of waitCV before the lock is unlocked.
- *
- * This function is called by _PR_MD_WAIT_CV and _PR_MD_UNLOCK,
- * the two places where a lock is unlocked.
- */
-static void
-md_UnlockAndPostNotifies(
-    _MDLock *lock,
-    PRThread *waitThred,
-    _MDCVar *waitCV)
-{
-    PRIntn index;
-    _MDNotified post;
-    _MDNotified *notified, *prev = NULL;
-
-    /*
-     * Time to actually notify any conditions that were affected
-     * while the lock was held.  Get a copy of the list that's in
-     * the lock structure and then zero the original.  If it's
-     * linked to other such structures, we own that storage.
-     */
-    post = lock->notified;  /* a safe copy; we own the lock */
-
-#if defined(DEBUG)
-    ZeroMemory(&lock->notified, sizeof(_MDNotified));  /* reset */
-#else
-    lock->notified.length = 0;  /* these are really sufficient */
-    lock->notified.link = NULL;
-#endif
-
-    /* 
-     * Figure out how many threads we need to wake up.
-     */
-    notified = &post;  /* this is where we start */
-    do {
-        for (index = 0; index < notified->length; ++index) {
-            _MDCVar *cv = notified->cv[index].cv;
-            PRThread *thred;
-            int i;
-            
-            /* Fast special case: no waiting threads */
-            if (cv->waitHead == NULL) {
-                notified->cv[index].notifyHead = NULL;
-                continue;
-            }
-
-            /* General case */
-            if (-1 == notified->cv[index].times) {
-                /* broadcast */
-                thred = cv->waitHead;
-                while (thred != NULL) {
-                    thred->md.inCVWaitQueue = PR_FALSE;
-                    thred = thred->md.next;
-                }
-                notified->cv[index].notifyHead = cv->waitHead;
-                cv->waitHead = cv->waitTail = NULL;
-                cv->nwait = 0;
-            } else {
-                thred = cv->waitHead;
-                i = notified->cv[index].times;
-                while (thred != NULL && i > 0) {
-                    thred->md.inCVWaitQueue = PR_FALSE;
-                    thred = thred->md.next;
-                    i--;
-                }
-                notified->cv[index].notifyHead = cv->waitHead;
-                cv->waitHead = thred;
-                if (cv->waitHead == NULL) {
-                    cv->waitTail = NULL;
-                } else {
-                    if (cv->waitHead->md.prev != NULL) {
-                        cv->waitHead->md.prev->md.next = NULL;
-                        cv->waitHead->md.prev = NULL;
-                    }
-                }
-                cv->nwait -= notified->cv[index].times - i;
-            }
-        }
-        notified = notified->link;
-    } while (NULL != notified);
-
-    if (waitThred) {
-        AddThreadToCVWaitQueueInternal(waitThred, waitCV);
-    }
-
-    /* Release the lock before notifying */
-        LeaveCriticalSection(&lock->mutex);
-
-    notified = &post;  /* this is where we start */
-    do {
-        for (index = 0; index < notified->length; ++index) {
-            PRThread *thred;
-            PRThread *next;
-
-            thred = notified->cv[index].notifyHead;
-            while (thred != NULL) {
-                BOOL rv;
-
-                next = thred->md.next;
-                thred->md.prev = thred->md.next = NULL;
-
-                rv = ReleaseSemaphore(thred->md.blocked_sema, 1, NULL);
-                PR_ASSERT(rv != 0);
-                thred = next;
-            }
-        }
-        prev = notified;
-        notified = notified->link;
-        if (&post != prev) PR_DELETE(prev);
-    } while (NULL != notified);
-}
-
-/*
- * Notifies just get posted to the protecting mutex.  The
- * actual notification is done when the lock is released so that
- * MP systems don't contend for a lock that they can't have.
- */
-static void md_PostNotifyToCvar(_MDCVar *cvar, _MDLock *lock,
-        PRBool broadcast)
-{
-    PRIntn index = 0;
-    _MDNotified *notified = &lock->notified;
-
-    while (1) {
-        for (index = 0; index < notified->length; ++index) {
-            if (notified->cv[index].cv == cvar) {
-                if (broadcast) {
-                    notified->cv[index].times = -1;
-                } else if (-1 != notified->cv[index].times) {
-                    notified->cv[index].times += 1;
-                }
-                return;
-            }
-        }
-        /* if not full, enter new CV in this array */
-        if (notified->length < _MD_CV_NOTIFIED_LENGTH) break;
-
-        /* if there's no link, create an empty array and link it */
-        if (NULL == notified->link) {
-            notified->link = PR_NEWZAP(_MDNotified);
-        }
-
-        notified = notified->link;
-    }
-
-    /* A brand new entry in the array */
-    notified->cv[index].times = (broadcast) ? -1 : 1;
-    notified->cv[index].cv = cvar;
-    notified->length += 1;
-}
-
-/*
- * _PR_MD_NEW_CV() -- Creating new condition variable
- * ... Solaris uses cond_init() in similar function.
- *
- * returns: -1 on failure
- *          0 when it succeeds.
- *
- */
-PRInt32 
-_PR_MD_NEW_CV(_MDCVar *cv)
-{
-    cv->magic = _MD_MAGIC_CV;
-    /*
-     * The waitHead, waitTail, and nwait fields are zeroed
-     * when the PRCondVar structure is created.
-     */
-    return 0;
-} 
-
-void _PR_MD_FREE_CV(_MDCVar *cv)
-{
-    cv->magic = (PRUint32)-1;
-    return;
-}
-
-/*
- *  _PR_MD_WAIT_CV() -- Wait on condition variable
- */
-void _PR_MD_WAIT_CV(_MDCVar *cv, _MDLock *lock, PRIntervalTime timeout )
-{
-    PRThread *thred = _PR_MD_CURRENT_THREAD();
-    DWORD rv;
-    DWORD msecs = (timeout == PR_INTERVAL_NO_TIMEOUT) ?
-            INFINITE : PR_IntervalToMilliseconds(timeout);
-
-    /*
-     * If we have pending notifies, post them now.
-     */
-    if (0 != lock->notified.length) {
-        md_UnlockAndPostNotifies(lock, thred, cv);
-    } else {
-        AddThreadToCVWaitQueueInternal(thred, cv);
-        LeaveCriticalSection(&lock->mutex);
-    }
-
-    /* Wait for notification or timeout; don't really care which */
-    rv = WaitForSingleObject(thred->md.blocked_sema, msecs);
-
-    EnterCriticalSection(&(lock->mutex));
-
-    PR_ASSERT(rv != WAIT_ABANDONED);
-    PR_ASSERT(rv != WAIT_FAILED);
-    PR_ASSERT(rv != WAIT_OBJECT_0 || thred->md.inCVWaitQueue == PR_FALSE);
-
-    if (rv == WAIT_TIMEOUT) {
-        if (thred->md.inCVWaitQueue) {
-            PR_ASSERT((cv->waitTail != NULL && cv->waitHead != NULL)
-                    || (cv->waitTail == NULL && cv->waitHead == NULL));
-            cv->nwait -= 1;
-            thred->md.inCVWaitQueue = PR_FALSE;
-            if (cv->waitHead == thred) {
-                cv->waitHead = thred->md.next;
-                if (cv->waitHead == NULL) {
-                    cv->waitTail = NULL;
-                } else {
-                    cv->waitHead->md.prev = NULL;
-                }
-            } else {
-                PR_ASSERT(thred->md.prev != NULL);
-                thred->md.prev->md.next = thred->md.next;
-                if (thred->md.next != NULL) {
-                    thred->md.next->md.prev = thred->md.prev;
-                } else {
-                    PR_ASSERT(cv->waitTail == thred);
-                    cv->waitTail = thred->md.prev;
-                }
-            }
-            thred->md.next = thred->md.prev = NULL;
-        } else {
-            /*
-             * This thread must have been notified, but the
-             * ReleaseSemaphore call happens after WaitForSingleObject
-             * times out.  Wait on the semaphore again to make it
-             * non-signaled.  We assume this wait won't take long.
-             */
-            rv = WaitForSingleObject(thred->md.blocked_sema, INFINITE);
-            PR_ASSERT(rv == WAIT_OBJECT_0);
-        }
-    }
-    PR_ASSERT(thred->md.inCVWaitQueue == PR_FALSE);
-    return;
-} /* --- end _PR_MD_WAIT_CV() --- */
-
-void _PR_MD_NOTIFY_CV(_MDCVar *cv, _MDLock *lock)
-{
-    md_PostNotifyToCvar(cv, lock, PR_FALSE);
-    return;
-}
-
-void _PR_MD_NOTIFYALL_CV(_MDCVar *cv, _MDLock *lock)
-{
-    md_PostNotifyToCvar(cv, lock, PR_TRUE);
-    return;
-}
-
-typedef BOOL (WINAPI *INITIALIZECRITICALSECTIONEX)(
-    CRITICAL_SECTION *lpCriticalSection,
-    DWORD dwSpinCount,
-    DWORD Flags);
-
-static INITIALIZECRITICALSECTIONEX sInitializeCriticalSectionEx;
-
-void _PR_MD_INIT_LOCKS(void)
-{
-    /*
-     * Starting with Windows Vista, every CRITICAL_SECTION allocates an extra
-     * RTL_CRITICAL_SECTION_DEBUG object. Unfortunately, this debug object is
-     * not reclaimed by DeleteCriticalSection(), causing an apparent memory
-     * leak. This is a debugging "feature", not a bug. If we are running on
-     * Vista or later, use InitializeCriticalSectionEx() to allocate
-     * CRITICAL_SECTIONs without debug objects.
-     */
-    HMODULE hKernel32 = GetModuleHandle("kernel32.dll");
-    PR_ASSERT(hKernel32);
-    PR_ASSERT(!sInitializeCriticalSectionEx);
-    sInitializeCriticalSectionEx = (INITIALIZECRITICALSECTIONEX)
-            GetProcAddress(hKernel32, "InitializeCriticalSectionEx");
-}
-
-/*
- * By default, CRITICAL_SECTIONs are initialized with a spin count of 0.
- * Joe Duffy's "Concurrent Programming on Windows" book suggests 1500 is
- * a "reasonable starting point". On single-processor systems, the spin
- * count is ignored and the critical section spin count is set to 0.
- */
-#define LOCK_SPIN_COUNT 1500
-
-PRStatus _PR_MD_NEW_LOCK(_MDLock *lock)
-{
-    CRITICAL_SECTION *cs = &lock->mutex;
-    BOOL ok;
-
-    if (sInitializeCriticalSectionEx) {
-        ok = sInitializeCriticalSectionEx(cs, LOCK_SPIN_COUNT,
-                                          CRITICAL_SECTION_NO_DEBUG_INFO);
-    } else {
-        ok = InitializeCriticalSectionAndSpinCount(cs, LOCK_SPIN_COUNT);
-    }
-    if (!ok) {
-        _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
-        return PR_FAILURE;
-    }
-
-    lock->notified.length = 0;
-    lock->notified.link = NULL;
-    return PR_SUCCESS;
-}
-
-void _PR_MD_UNLOCK(_MDLock *lock)
-{
-    if (0 != lock->notified.length) {
-        md_UnlockAndPostNotifies(lock, NULL, NULL);
-    } else {
-        LeaveCriticalSection(&lock->mutex);
-    }
-}