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Implement __gthread_once.

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This commit is contained in:
James Benton 2018-05-25 17:35:21 +01:00
parent b00b5af1ec
commit 3336fbaf5d
1 changed files with 24 additions and 4 deletions
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28
libraries/wutstdc++/include/bits/gthr-default.h
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@ -29,6 +29,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#define __GTHREADS 1
#define __GTHREADS_CXX0X 1
#include <coreinit/atomic.h>
#include <coreinit/condition.h>
#include <coreinit/thread.h>
#include <coreinit/mutex.h>
@ -41,7 +42,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#define _GTHREAD_USE_MUTEX_TIMEDLOCK 0
typedef OSThread *__gthread_t;
typedef uint32_t __gthread_once_t;
typedef volatile uint32_t __gthread_once_t;
typedef OSMutex __gthread_mutex_t;
typedef OSMutex __gthread_recursive_mutex_t;
typedef OSCondition __gthread_cond_t;
@ -52,7 +53,11 @@ typedef void *__gthread_key_t;
#define __GTHREAD_HAS_COND 1
#define __GTHREAD_ONCE_INIT { }
#define __GTHREAD_ONCE_VALUE_INIT (0)
#define __GTHREAD_ONCE_VALUE_STARTED (1)
#define __GTHREAD_ONCE_VALUE_DONE (2)
#define __GTHREAD_ONCE_INIT __GTHREAD_ONCE_VALUE_INIT
#define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
#define __GTHREAD_COND_INIT_FUNCTION __gthread_cond_init_function
@ -139,8 +144,23 @@ __gthread_yield (void)
static inline int
__gthread_once (__gthread_once_t *__once, void (*__func) (void))
{
// TODO: Implement __gthread_once
return -1;
uint32_t value = 0;
if (OSCompareAndSwapAtomicEx(__once,
__GTHREAD_ONCE_VALUE_INIT,
__GTHREAD_ONCE_VALUE_STARTED,
&value)) {
__func();
OSCompareAndSwapAtomic(__once,
__GTHREAD_ONCE_VALUE_STARTED,
__GTHREAD_ONCE_VALUE_DONE);
} else if (value != __GTHREAD_ONCE_VALUE_DONE) {
while (!OSCompareAndSwapAtomic(__once,
__GTHREAD_ONCE_VALUE_DONE,
__GTHREAD_ONCE_VALUE_DONE));
}
return 0;
}
static inline int