62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
#include "LockFreeLIFO.h"
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#include "foundation/atomics.h"
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/* TODO: on windows, replace with InitializeSListHead/InterlockedPushEntrySList/InterlockedPopEntrySList just to be safe */
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void lifo_init(lifo_t *lifo)
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{
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lifo->head = 0;
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}
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void lifo_push(lifo_t *lifo, queue_node_t *cl)
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{
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queue_node_t *new_head = cl;
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queue_node_t *old_head = 0;
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do
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{
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old_head = (queue_node_t *)lifo->head;
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new_head->Next = old_head;
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} while (!nx_atomic_cmpxchg_pointer(old_head, new_head, (void * volatile *)&lifo->head));
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}
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queue_node_t *lifo_pop(lifo_t *lifo)
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{
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queue_node_t *new_head = 0, *old_head = 0;
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do
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{
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old_head = (queue_node_t *)lifo->head;
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if (old_head)
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new_head = old_head->Next;
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else
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new_head = 0;
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} while (!nx_atomic_cmpxchg_pointer(old_head, new_head, (void * volatile *)&lifo->head));
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return old_head;
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}
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queue_node_t *lifo_malloc(size_t bytes)
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{
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#ifdef __GNUC__
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# ifdef __APPLE__
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void *v = 0;
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(void) posix_memalign(&v, sizeof(void *), bytes);
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return v;
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# else
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return memalign(bytes, sizeof(void *));
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# endif
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#elif defined(_WIN32)
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return _aligned_malloc(bytes, MEMORY_ALLOCATION_ALIGNMENT);
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#else
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#error port me!
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#endif
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}
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void lifo_free(queue_node_t *ptr)
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{
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#ifdef __GNUC__
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free(ptr);
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#elif defined(_WIN32)
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_aligned_free(ptr);
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#else
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#error port me!
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#endif
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}
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