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pthread and synccall cleanup, new __synccall_wait op

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fix up clone signature to match the actual behavior. the new
__syncall_wait function allows a __synccall callback to wait for other
threads to continue without returning, so that it can resume action
after the caller finishes. this interface could be made significantly
more general/powerful with minimal effort, but i'll wait to do that
until it's actually useful for something.
This commit is contained in:
Rich Felker
2011-08-12 10:32:22 -04:00
parent b1a7102d83
commit 407d933052
4 changed files with 13 additions and 7 deletions
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12
src/thread/synccall.c
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@ -4,7 +4,7 @@
static struct chain {
struct chain *next;
sem_t sem, sem2;
} *head;
} *head, *cur;
static void (*callback)(void *), *context;
static int chainlen;
@ -47,11 +47,19 @@ static void handler(int sig, siginfo_t *si, void *ctx)
errno = old_errno;
}
void __synccall_wait()
{
struct chain *ch = cur;
sem_post(&ch->sem2);
while (sem_wait(&ch->sem));
sem_post(&ch->sem);
}
void __synccall(void (*func)(void *), void *ctx)
{
pthread_t self;
struct sigaction sa;
struct chain *cur, *next;
struct chain *next;
uint64_t oldmask;
if (!libc.threads_minus_1) {