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https://github.com/darlinghq/darling-libobjc2.git
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58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
#include <stdlib.h>
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#include "lock.h"
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#ifndef POOL_TYPE
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#error POOL_TYPE must be defined
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#endif
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#ifndef POOL_TYPE
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#error POOL_NAME must be defined
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#endif
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// Horrible multiple indirection to satisfy the weird precedence rules in cpp
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#define REALLY_PREFIX_SUFFIX(x,y) x ## y
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#define PREFIX_SUFFIX(x, y) REALLY_PREFIX_SUFFIX(x, y)
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#define NAME(x) PREFIX_SUFFIX(POOL_NAME, x)
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#define PAGE_SIZE 4096
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// Malloc one page at a time.
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#define POOL_SIZE ((PAGE_SIZE) / sizeof(POOL_TYPE))
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static POOL_TYPE* NAME(_pool);
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static int NAME(_pool_next_index) = -1;
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#ifdef THREAD_SAFE_POOL
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static mutex_t NAME(_lock);
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#define LOCK_POOL() LOCK(&POOL_NAME##_lock)
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#define UNLOCK_POOL() LOCK(&POOL_NAME##_lock)
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#else
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#define LOCK_POOL()
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#define UNLOCK_POOL()
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#endif
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static int pool_size = 0;
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static int pool_allocs = 0;
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static inline POOL_TYPE*NAME(_pool_alloc)(void)
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{
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LOCK_POOL();
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pool_allocs++;
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if (0 > NAME(_pool_next_index))
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{
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NAME(_pool) = malloc(PAGE_SIZE);
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NAME(_pool_next_index) = POOL_SIZE - 1;
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pool_size += PAGE_SIZE;
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}
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POOL_TYPE* new = &NAME(_pool)[NAME(_pool_next_index)--];
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UNLOCK_POOL();
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return new;
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}
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#undef NAME
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#undef POOL_SIZE
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#undef PAGE_SIZE
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#undef POOL_NAME
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#undef POOL_TYPE
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#undef LOCK_POOL
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#undef UNLOCK_POOL
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#ifdef THREAD_SAFE_POOL
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#undef THREAD_SAFE_POOL
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#endif
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