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sem_close: Use __twalk_r

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This commit is contained in:
Florian Weimer
2019-05-10 14:17:26 +02:00
parent eb669ff5bf
commit 4aee85f96b
2 changed files with 21 additions and 13 deletions
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28
nptl/sem_close.c
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@ -21,21 +21,20 @@
#include <sys/mman.h>
#include "semaphoreP.h"
/* Global variables to parametrize the walk function. This works
since we always have to use locks. And we have to use the twalk
function since the entries are not sorted wrt the mapping
address. */
static sem_t *the_sem;
static struct inuse_sem *rec;
struct walk_closure
{
sem_t *the_sem;
struct inuse_sem *rec;
};
static void
walker (const void *inodep, const VISIT which, const int depth)
walker (const void *inodep, VISIT which, void *closure0)
{
struct walk_closure *closure = closure0;
struct inuse_sem *nodep = *(struct inuse_sem **) inodep;
if (nodep->sem == the_sem)
rec = nodep;
if (nodep->sem == closure->the_sem)
closure->rec = nodep;
}
@ -48,9 +47,12 @@ sem_close (sem_t *sem)
lll_lock (__sem_mappings_lock, LLL_PRIVATE);
/* Locate the entry for the mapping the caller provided. */
rec = NULL;
the_sem = sem;
__twalk (__sem_mappings, walker);
struct inuse_sem *rec;
{
struct walk_closure closure = { .the_sem = sem, .rec = NULL };
__twalk_r (__sem_mappings, walker, &closure);
rec = closure.rec;
}
if (rec != NULL)
{
/* Check the reference counter. If it is going to be zero, free