#include "apr.h"
#include "apr_atomic.h"
#include <stdlib.h>
apr_status_t apr_atomic_init(apr_pool_t *p)
{
return APR_SUCCESS;
}
apr_uint32_t apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val)
{
apr_uint32_t old, new_val;
old = *mem;
do {
new_val = old + val;
} while (__cs(&old, (cs_t *)mem, new_val));
return old;
}
void apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val)
{
apr_uint32_t old, new_val;
old = *mem;
do {
new_val = old - val;
} while (__cs(&old, (cs_t *)mem, new_val));
}
apr_uint32_t apr_atomic_inc32(volatile apr_uint32_t *mem)
{
return apr_atomic_add32(mem, 1);
}
int apr_atomic_dec32(volatile apr_uint32_t *mem)
{
apr_uint32_t old, new_val;
old = *mem;
do {
new_val = old - 1;
} while (__cs(&old, (cs_t *)mem, new_val));
return new_val != 0;
}
apr_uint32_t apr_atomic_read32(volatile apr_uint32_t *mem)
{
return *mem;
}
void apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val)
{
*mem = val;
}
apr_uint32_t apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t swap,
apr_uint32_t cmp)
{
apr_uint32_t old = cmp;
__cs(&old, (cs_t *)mem, swap);
return old;
}
#if APR_SIZEOF_VOIDP == 4
void *apr_atomic_casptr(volatile void **mem_ptr,
void *swap_ptr,
const void *cmp_ptr)
{
__cs1(&cmp_ptr,
mem_ptr,
&swap_ptr);
return (void *)cmp_ptr;
}
#elif APR_SIZEOF_VOIDP == 8
void *apr_atomic_casptr(volatile void **mem_ptr,
void *swap_ptr,
const void *cmp_ptr)
{
__csg(&cmp_ptr,
mem_ptr,
&swap_ptr);
return (void *)cmp_ptr;
}
#else
#error APR_SIZEOF_VOIDP value not supported
#endif
apr_uint32_t apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val)
{
apr_uint32_t old, new_val;
old = *mem;
do {
new_val = val;
} while (__cs(&old, (cs_t *)mem, new_val));
return old;
}
APR_DECLARE(void*) apr_atomic_xchgptr(volatile void **mem_ptr, void *new_ptr)
{
void *old_ptr;
old_ptr = *(void **)mem_ptr;
#if APR_SIZEOF_VOIDP == 4
do {
} while (__cs1(&old_ptr, mem_ptr, &new_ptr));
#elif APR_SIZEOF_VOIDP == 8
do {
} while (__csg(&old_ptr, mem_ptr, &new_ptr));
#else
#error APR_SIZEOF_VOIDP value not supported
#endif
return old_ptr;
}