add support for thread scheduling (POSIX TPS option)

[musl] / src / thread / pthread_create.c

diff --git a/src/thread/pthread_create.c b/src/thread/pthread_create.c
index a7aadb5..a65e88e 100644 (file)
--- a/src/thread/pthread_create.c
+++ b/src/thread/pthread_create.c
@@ -62,6 +62,15 @@ void __do_cleanup_pop(struct __ptcb *cb)
 static int start(void *p)
 {
        pthread_t self = p;
+       if (self->startlock[0]) {
+               __wait(self->startlock, 0, 1, 1);
+               if (self->startlock[0]) {
+                       self->detached = 2;
+                       pthread_exit(0);
+               }
+               __syscall(SYS_rt_sigprocmask, SIG_SETMASK,
+                       self->sigmask, 0, __SYSCALL_SSLEN);
+       }
        if (self->unblock_cancel)
                __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
                        SIGPT_SET, 0, __SYSCALL_SSLEN);
@@ -95,6 +104,7 @@ int pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attr,
        struct pthread *self = pthread_self(), *new;
        unsigned char *map, *stack, *tsd;
        unsigned flags = 0x7d8f00;
+       int do_sched = 0;
 
        if (!self) return ENOSYS;
        if (!libc.threaded) {
@@ -144,6 +154,11 @@ int pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attr,
                new->detached = 1;
                flags -= 0x200000;
        }
+       if (attr && attr->_a_sched) {
+               do_sched = new->startlock[0] = 1;
+               __syscall(SYS_rt_sigprocmask, SIG_BLOCK,
+                       SIGALL_SET, self->sigmask, __SYSCALL_SSLEN);
+       }
        new->unblock_cancel = self->cancel;
        new->canary = self->canary;
 
@@ -152,11 +167,25 @@ int pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attr,
 
        __release_ptc();
 
+       if (do_sched) {
+               __syscall(SYS_rt_sigprocmask, SIG_SETMASK,
+                       new->sigmask, 0, __SYSCALL_SSLEN);
+       }
+
        if (ret < 0) {
                a_dec(&libc.threads_minus_1);
                munmap(map, size);
                return EAGAIN;
        }
+
+       if (do_sched) {
+               ret = __syscall(SYS_sched_setscheduler, new->tid,
+                       attr->_a_policy, &attr->_a_prio);
+               a_store(new->startlock, ret<0 ? 2 : 0);
+               __wake(new->startlock, 1, 1);
+               if (ret < 0) return -ret;
+       }
+
        *res = new;
        return 0;
 }