173 lines
6.3 KiB
Plaintext
173 lines
6.3 KiB
Plaintext
// Filename: atomicAdjustPosixImpl.I
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// Created by: drose (10Feb06)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) 2001 - 2004, Disney Enterprises, Inc. All rights reserved
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//
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// All use of this software is subject to the terms of the Panda 3d
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// Software license. You should have received a copy of this license
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// along with this source code; you will also find a current copy of
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// the license at http://etc.cmu.edu/panda3d/docs/license/ .
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//
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// To contact the maintainers of this program write to
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// panda3d-general@lists.sourceforge.net .
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//
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////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////
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// Function: AtomicAdjustPosixImpl::inc
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// Access: Public, Static
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// Description: Atomically increments the indicated variable.
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////////////////////////////////////////////////////////////////////
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INLINE void AtomicAdjustPosixImpl::
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inc(TVOLATILE PN_int32 &var) {
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pthread_mutex_lock(&_mutex);
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++var;
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pthread_mutex_unlock(&_mutex);
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}
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////////////////////////////////////////////////////////////////////
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// Function: AtomicAdjustPosixImpl::dec
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// Access: Public, Static
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// Description: Atomically decrements the indicated variable and
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// returns true if the new value is nonzero, false if it
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// is zero.
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////////////////////////////////////////////////////////////////////
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INLINE bool AtomicAdjustPosixImpl::
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dec(TVOLATILE PN_int32 &var) {
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pthread_mutex_lock(&_mutex);
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PN_int32 result = --var;
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pthread_mutex_unlock(&_mutex);
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return (result != 0);
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}
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////////////////////////////////////////////////////////////////////
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// Function: AtomicAdjustPosixImpl::add
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// Access: Public, Static
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// Description: Atomically computes var += delta. It is legal for
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// delta to be negative.
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////////////////////////////////////////////////////////////////////
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INLINE void AtomicAdjustPosixImpl::
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add(TVOLATILE PN_int32 &var, PN_int32 delta) {
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pthread_mutex_lock(&_mutex);
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var += delta;
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pthread_mutex_unlock(&_mutex);
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}
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////////////////////////////////////////////////////////////////////
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// Function: AtomicAdjustPosixImpl::set
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// Access: Public, Static
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// Description: Atomically changes the indicated variable and
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// returns the original value.
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////////////////////////////////////////////////////////////////////
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INLINE PN_int32 AtomicAdjustPosixImpl::
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set(TVOLATILE PN_int32 &var, PN_int32 new_value) {
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pthread_mutex_lock(&_mutex);
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PN_int32 orig_value = var;
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var = new_value;
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pthread_mutex_unlock(&_mutex);
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return orig_value;
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}
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////////////////////////////////////////////////////////////////////
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// Function: AtomicAdjustPosixImpl::get
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// Access: Public, Static
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// Description: Atomically retrieves the snapshot value of the
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// indicated variable. This is the only guaranteed safe
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// way to retrieve the value that other threads might be
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// asynchronously setting, incrementing, or decrementing
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// (via other AtomicAjust methods).
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////////////////////////////////////////////////////////////////////
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INLINE PN_int32 AtomicAdjustPosixImpl::
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get(const TVOLATILE PN_int32 &var) {
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pthread_mutex_lock(&_mutex);
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PN_int32 orig_value = var;
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pthread_mutex_unlock(&_mutex);
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return orig_value;
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}
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////////////////////////////////////////////////////////////////////
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// Function: AtomicAdjustPosixImpl::set_ptr
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// Access: Public, Static
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// Description: Atomically changes the indicated variable and
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// returns the original value.
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////////////////////////////////////////////////////////////////////
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INLINE void *AtomicAdjustPosixImpl::
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set_ptr(void * TVOLATILE &var, void *new_value) {
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pthread_mutex_lock(&_mutex);
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void *orig_value = var;
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var = new_value;
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pthread_mutex_unlock(&_mutex);
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return orig_value;
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}
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////////////////////////////////////////////////////////////////////
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// Function: AtomicAdjustPosixImpl::get_ptr
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// Access: Public, Static
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// Description: Atomically retrieves the snapshot value of the
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// indicated variable. This is the only guaranteed safe
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// way to retrieve the value that other threads might be
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// asynchronously setting, incrementing, or decrementing
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// (via other AtomicAjust methods).
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////////////////////////////////////////////////////////////////////
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INLINE void *AtomicAdjustPosixImpl::
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get_ptr(void * const TVOLATILE &var) {
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pthread_mutex_lock(&_mutex);
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void *orig_value = var;
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pthread_mutex_unlock(&_mutex);
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return orig_value;
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}
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////////////////////////////////////////////////////////////////////
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// Function: AtomicAdjustPosixImpl::compare_and_exchange
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// Access: Public, Static
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// Description: Atomic compare and exchange.
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//
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// If mem is equal to old_value, store new_value in mem.
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// In either case, return the original value of mem.
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// The caller can test for success by comparing
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// return_value == old_value.
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//
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// The atomic function expressed in pseudo-code:
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//
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// orig_value = mem;
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// if (mem == old_value) {
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// mem = new_value;
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// }
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// return orig_value;
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//
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////////////////////////////////////////////////////////////////////
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INLINE PN_int32 AtomicAdjustPosixImpl::
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compare_and_exchange(TVOLATILE PN_int32 &mem, PN_int32 old_value,
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PN_int32 new_value) {
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pthread_mutex_lock(&_mutex);
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PN_int32 orig_value = mem;
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if (mem == old_value) {
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mem = new_value;
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}
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pthread_mutex_unlock(&_mutex);
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return orig_value;
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}
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////////////////////////////////////////////////////////////////////
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// Function: AtomicAdjustPosixImpl::compare_and_exchange_ptr
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// Access: Public, Static
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// Description: Atomic compare and exchange.
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//
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// As above, but works on pointers instead of integers.
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////////////////////////////////////////////////////////////////////
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INLINE void *AtomicAdjustPosixImpl::
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compare_and_exchange_ptr(void * TVOLATILE &mem, void *old_value,
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void *new_value) {
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pthread_mutex_lock(&_mutex);
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void *orig_value = mem;
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if (mem == old_value) {
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mem = new_value;
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}
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pthread_mutex_unlock(&_mutex);
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return orig_value;
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}
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