Delete bundled copy of NSS and replace with README.

nspr/pr/src/misc/pratom.c

Index: nspr/pr/src/misc/pratom.c
diff --git a/nspr/pr/src/misc/pratom.c b/nspr/pr/src/misc/pratom.c
deleted file mode 100644
index 95bbee1d52083a18c2d63587f65fe31490d7c24b..0000000000000000000000000000000000000000
--- a/nspr/pr/src/misc/pratom.c
+++ /dev/null
@@ -1,379 +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/. */
-
-/*
-**     PR Atomic operations
-*/
-
-
-#include "pratom.h"
-#include "primpl.h"
-
-#include <string.h>
-
-/*
- * The following is a fallback implementation that emulates
- * atomic operations for platforms without atomic operations.
- * If a platform has atomic operations, it should define the
- * macro _PR_HAVE_ATOMIC_OPS, and the following will not be
- * compiled in.
- */
-
-#if !defined(_PR_HAVE_ATOMIC_OPS)
-
-#if defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)
-/*
- * PR_AtomicDecrement() is used in NSPR's thread-specific data
- * destructor.  Because thread-specific data destructors may be
- * invoked after a PR_Cleanup() call, we need an implementation
- * of the atomic routines that doesn't need NSPR to be initialized.
- */
-
-/*
- * We use a set of locks for all the emulated atomic operations.
- * By hashing on the address of the integer to be locked the
- * contention between multiple threads should be lessened.
- *
- * The number of atomic locks can be set by the environment variable
- * NSPR_ATOMIC_HASH_LOCKS
- */
-
-/*
- * lock counts should be a power of 2
- */
-#define DEFAULT_ATOMIC_LOCKS	16	/* should be in sync with the number of initializers
-										below */
-#define MAX_ATOMIC_LOCKS		(4 * 1024)
-
-static pthread_mutex_t static_atomic_locks[DEFAULT_ATOMIC_LOCKS] = {
-        PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER,
-        PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER,
-        PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER,
-        PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER,
-        PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER,
-        PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER,
-        PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER,
-        PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER };
-
-#ifdef DEBUG
-static PRInt32 static_hash_lock_counts[DEFAULT_ATOMIC_LOCKS];
-static PRInt32 *hash_lock_counts = static_hash_lock_counts;
-#endif
-
-static PRUint32	num_atomic_locks = DEFAULT_ATOMIC_LOCKS;
-static pthread_mutex_t *atomic_locks = static_atomic_locks;
-static PRUint32 atomic_hash_mask = DEFAULT_ATOMIC_LOCKS - 1;
-
-#define _PR_HASH_FOR_LOCK(ptr) 							\
-			((PRUint32) (((PRUptrdiff) (ptr) >> 2)	^	\
-						((PRUptrdiff) (ptr) >> 8)) &	\
-						atomic_hash_mask)
-
-void _PR_MD_INIT_ATOMIC()
-{
-char *eval;
-int index;
-
-
-	PR_ASSERT(PR_FloorLog2(MAX_ATOMIC_LOCKS) ==
-						PR_CeilingLog2(MAX_ATOMIC_LOCKS));
-
-	PR_ASSERT(PR_FloorLog2(DEFAULT_ATOMIC_LOCKS) ==
-							PR_CeilingLog2(DEFAULT_ATOMIC_LOCKS));
-
-	if (((eval = getenv("NSPR_ATOMIC_HASH_LOCKS")) != NULL)  &&
-		((num_atomic_locks = atoi(eval)) != DEFAULT_ATOMIC_LOCKS)) {
-
-		if (num_atomic_locks > MAX_ATOMIC_LOCKS)
-			num_atomic_locks = MAX_ATOMIC_LOCKS;
-		else if (num_atomic_locks < 1) 
-			num_atomic_locks = 1;
-		else {
-			num_atomic_locks = PR_FloorLog2(num_atomic_locks);
-			num_atomic_locks = 1L << num_atomic_locks;
-		}
-		atomic_locks = (pthread_mutex_t *) PR_Malloc(sizeof(pthread_mutex_t) *
-						num_atomic_locks);
-		if (atomic_locks) {
-			for (index = 0; index < num_atomic_locks; index++) {
-				if (pthread_mutex_init(&atomic_locks[index], NULL)) {
-						PR_DELETE(atomic_locks);
-						atomic_locks = NULL;
-						break; 
-				}
-			}
-		}
-#ifdef DEBUG
-		if (atomic_locks) {
-			hash_lock_counts = PR_CALLOC(num_atomic_locks * sizeof(PRInt32));
-			if (hash_lock_counts == NULL) {
-				PR_DELETE(atomic_locks);
-				atomic_locks = NULL;
-			}
-		}
-#endif
-		if (atomic_locks == NULL) {
-			/*
-			 *	Use statically allocated locks
-			 */
-			atomic_locks = static_atomic_locks;
-			num_atomic_locks = DEFAULT_ATOMIC_LOCKS;
-	#ifdef DEBUG
-			hash_lock_counts = static_hash_lock_counts;
-	#endif
-		}
-		atomic_hash_mask = num_atomic_locks - 1;
-	}
-	PR_ASSERT(PR_FloorLog2(num_atomic_locks) ==
-								PR_CeilingLog2(num_atomic_locks));
-}
-
-PRInt32
-_PR_MD_ATOMIC_INCREMENT(PRInt32 *val)
-{
-    PRInt32 rv;
-    PRInt32 idx = _PR_HASH_FOR_LOCK(val);
-
-    pthread_mutex_lock(&atomic_locks[idx]);
-    rv = ++(*val);
-#ifdef DEBUG
-    hash_lock_counts[idx]++;
-#endif
-    pthread_mutex_unlock(&atomic_locks[idx]);
-    return rv;
-}
-
-PRInt32
-_PR_MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 val)
-{
-    PRInt32 rv;
-    PRInt32 idx = _PR_HASH_FOR_LOCK(ptr);
-
-    pthread_mutex_lock(&atomic_locks[idx]);
-    rv = ((*ptr) += val);
-#ifdef DEBUG
-    hash_lock_counts[idx]++;
-#endif
-    pthread_mutex_unlock(&atomic_locks[idx]);
-    return rv;
-}
-
-PRInt32
-_PR_MD_ATOMIC_DECREMENT(PRInt32 *val)
-{
-    PRInt32 rv;
-    PRInt32 idx = _PR_HASH_FOR_LOCK(val);
-
-    pthread_mutex_lock(&atomic_locks[idx]);
-    rv = --(*val);
-#ifdef DEBUG
-    hash_lock_counts[idx]++;
-#endif
-    pthread_mutex_unlock(&atomic_locks[idx]);
-    return rv;
-}
-
-PRInt32
-_PR_MD_ATOMIC_SET(PRInt32 *val, PRInt32 newval)
-{
-    PRInt32 rv;
-    PRInt32 idx = _PR_HASH_FOR_LOCK(val);
-
-    pthread_mutex_lock(&atomic_locks[idx]);
-    rv = *val;
-    *val = newval;
-#ifdef DEBUG
-    hash_lock_counts[idx]++;
-#endif
-    pthread_mutex_unlock(&atomic_locks[idx]);
-    return rv;
-}
-#else  /* _PR_PTHREADS && !_PR_DCETHREADS */
-/*
- * We use a single lock for all the emulated atomic operations.
- * The lock contention should be acceptable.
- */
-static PRLock *atomic_lock = NULL;
-void _PR_MD_INIT_ATOMIC(void)
-{
-    if (atomic_lock == NULL) {
-        atomic_lock = PR_NewLock();
-    }
-}
-
-PRInt32
-_PR_MD_ATOMIC_INCREMENT(PRInt32 *val)
-{
-    PRInt32 rv;
-
-    if (!_pr_initialized) {
-        _PR_ImplicitInitialization();
-    }
-    PR_Lock(atomic_lock);
-    rv = ++(*val);
-    PR_Unlock(atomic_lock);
-    return rv;
-}
-
-PRInt32
-_PR_MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 val)
-{
-    PRInt32 rv;
-
-    if (!_pr_initialized) {
-        _PR_ImplicitInitialization();
-    }
-    PR_Lock(atomic_lock);
-    rv = ((*ptr) += val);
-    PR_Unlock(atomic_lock);
-    return rv;
-}
-
-PRInt32
-_PR_MD_ATOMIC_DECREMENT(PRInt32 *val)
-{
-    PRInt32 rv;
-
-    if (!_pr_initialized) {
-        _PR_ImplicitInitialization();
-    }
-    PR_Lock(atomic_lock);
-    rv = --(*val);
-    PR_Unlock(atomic_lock);
-    return rv;
-}
-
-PRInt32
-_PR_MD_ATOMIC_SET(PRInt32 *val, PRInt32 newval)
-{
-    PRInt32 rv;
-
-    if (!_pr_initialized) {
-        _PR_ImplicitInitialization();
-    }
-    PR_Lock(atomic_lock);
-    rv = *val;
-    *val = newval;
-    PR_Unlock(atomic_lock);
-    return rv;
-}
-#endif  /* _PR_PTHREADS && !_PR_DCETHREADS */
-
-#endif  /* !_PR_HAVE_ATOMIC_OPS */
-
-void _PR_InitAtomic(void)
-{
-    _PR_MD_INIT_ATOMIC();
-}
-
-PR_IMPLEMENT(PRInt32)
-PR_AtomicIncrement(PRInt32 *val)
-{
-    return _PR_MD_ATOMIC_INCREMENT(val);
-}
-
-PR_IMPLEMENT(PRInt32)
-PR_AtomicDecrement(PRInt32 *val)
-{
-    return _PR_MD_ATOMIC_DECREMENT(val);
-}
-
-PR_IMPLEMENT(PRInt32)
-PR_AtomicSet(PRInt32 *val, PRInt32 newval)
-{
-    return _PR_MD_ATOMIC_SET(val, newval);
-}
-
-PR_IMPLEMENT(PRInt32)
-PR_AtomicAdd(PRInt32 *ptr, PRInt32 val)
-{
-    return _PR_MD_ATOMIC_ADD(ptr, val);
-}
-/*
- * For platforms, which don't support the CAS (compare-and-swap) instruction
- * (or an equivalent), the stack operations are implemented by use of PRLock
- */
-
-PR_IMPLEMENT(PRStack *)
-PR_CreateStack(const char *stack_name)
-{
-PRStack *stack;
-
-    if (!_pr_initialized) {
-        _PR_ImplicitInitialization();
-    }
-
-    if ((stack = PR_NEW(PRStack)) == NULL) {
-		return NULL;
-	}
-	if (stack_name) {
-		stack->prstk_name = (char *) PR_Malloc(strlen(stack_name) + 1);
-		if (stack->prstk_name == NULL) {
-			PR_DELETE(stack);
-			return NULL;
-		}
-		strcpy(stack->prstk_name, stack_name);
-	} else
-		stack->prstk_name = NULL;
-
-#ifndef _PR_HAVE_ATOMIC_CAS
-    stack->prstk_lock = PR_NewLock();
-	if (stack->prstk_lock == NULL) {
-		PR_Free(stack->prstk_name);
-		PR_DELETE(stack);
-		return NULL;
-	}
-#endif /* !_PR_HAVE_ATOMIC_CAS */
-
-	stack->prstk_head.prstk_elem_next = NULL;
-	
-    return stack;
-}
-
-PR_IMPLEMENT(PRStatus)
-PR_DestroyStack(PRStack *stack)
-{
-	if (stack->prstk_head.prstk_elem_next != NULL) {
-		PR_SetError(PR_INVALID_STATE_ERROR, 0);
-		return PR_FAILURE;
-	}
-
-	if (stack->prstk_name)
-		PR_Free(stack->prstk_name);
-#ifndef _PR_HAVE_ATOMIC_CAS
-	PR_DestroyLock(stack->prstk_lock);
-#endif /* !_PR_HAVE_ATOMIC_CAS */
-	PR_DELETE(stack);
-
-	return PR_SUCCESS;
-}
-
-#ifndef _PR_HAVE_ATOMIC_CAS
-
-PR_IMPLEMENT(void)
-PR_StackPush(PRStack *stack, PRStackElem *stack_elem)
-{
-    PR_Lock(stack->prstk_lock);
-	stack_elem->prstk_elem_next = stack->prstk_head.prstk_elem_next;
-	stack->prstk_head.prstk_elem_next = stack_elem;
-    PR_Unlock(stack->prstk_lock);
-    return;
-}
-
-PR_IMPLEMENT(PRStackElem *)
-PR_StackPop(PRStack *stack)
-{
-PRStackElem *element;
-
-    PR_Lock(stack->prstk_lock);
-	element = stack->prstk_head.prstk_elem_next;
-	if (element != NULL) {
-		stack->prstk_head.prstk_elem_next = element->prstk_elem_next;
-		element->prstk_elem_next = NULL;	/* debugging aid */
-	}
-    PR_Unlock(stack->prstk_lock);
-    return element;
-}
-#endif /* !_PR_HAVE_ATOMIC_CAS */