1 #include "pthread_impl.h"
2
3 // Set a recursive lock to init status, memory is "01 00 ... 00"
__pthread_mutex_unlock_recursive_inner(pthread_mutex_t * m)4 void __pthread_mutex_unlock_recursive_inner(pthread_mutex_t *m)
5 {
6 char *p = (char *)m;
7 for (size_t i = 0;i < sizeof(pthread_mutex_t);i++) {
8 *(p + i) = 0;
9 }
10 m->_m_type = PTHREAD_MUTEX_RECURSIVE; // Set recursive flag
11 }
12
__pthread_mutex_unlock(pthread_mutex_t * m)13 int __pthread_mutex_unlock(pthread_mutex_t *m)
14 {
15 pthread_t self;
16 int waiters = m->_m_waiters;
17 int cont;
18 int type = m->_m_type & 15;
19 int priv = (m->_m_type & 128) ^ 128;
20 int new = 0;
21 int old;
22
23 if (type != PTHREAD_MUTEX_NORMAL) {
24 self = __pthread_self();
25 old = m->_m_lock;
26 int own = old & 0x3fffffff;
27 if (own != self->tid)
28 return EPERM;
29 #ifdef __LITEOS_A__
30 if ((type & PTHREAD_MUTEX_TYPE_MASK) == PTHREAD_MUTEX_RECURSIVE && m->_m_count)
31 #else
32 if (__is_mutex_destroyed(m->_m_type))
33 __handle_using_destroyed_mutex(m, __FUNCTION__);
34 if ((type&3) == PTHREAD_MUTEX_RECURSIVE && m->_m_count)
35 #endif
36 return m->_m_count--, 0;
37 if ((type&4) && (old&0x40000000))
38 new = 0x7fffffff;
39 if (!priv) {
40 self->robust_list.pending = &m->_m_next;
41 __vm_lock();
42 }
43 volatile void *prev = m->_m_prev;
44 volatile void *next = m->_m_next;
45 *(volatile void *volatile *)prev = next;
46 if (next != &self->robust_list.head) *(volatile void *volatile *)
47 ((char *)next - sizeof(void *)) = prev;
48 }
49 #ifdef __LITEOS_A__
50 cont = a_swap(&m->_m_lock, new);
51 #else
52 if (type&8) {
53 if (old<0 || a_cas(&m->_m_lock, old, new)!=old) {
54 if (new) a_store(&m->_m_waiters, -1);
55 __syscall(SYS_futex, &m->_m_lock, FUTEX_UNLOCK_PI|priv);
56 }
57 cont = 0;
58 waiters = 0;
59 } else {
60 cont = a_swap(&m->_m_lock, new);
61 }
62 #endif
63
64 if (type != PTHREAD_MUTEX_NORMAL && !priv) {
65 self->robust_list.pending = 0;
66 __vm_unlock();
67 }
68 if (waiters || cont<0)
69 __wake(&m->_m_lock, 1, priv);
70 return 0;
71 }
72
73 weak_alias(__pthread_mutex_unlock, pthread_mutex_unlock);
74