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https://github.com/fluencelabs/musl
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df7d0dfb9c
The intent of this is to avoid name space pollution of the C threads implementation. This has two sides to it. First we have to provide symbols that wouldn't pollute the name space for the C threads implementation. Second we have to clean up some internal uses of POSIX functions such that they don't implicitly drag in such symbols.
41 lines
1.0 KiB
C
41 lines
1.0 KiB
C
#include "pthread_impl.h"
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void __vm_lock_impl(int);
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void __vm_unlock_impl(void);
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int __pthread_mutex_unlock(pthread_mutex_t *m)
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{
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pthread_t self;
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int waiters = m->_m_waiters;
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int cont;
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int type = m->_m_type & 15;
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int priv = (m->_m_type & 128) ^ 128;
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if (type != PTHREAD_MUTEX_NORMAL) {
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self = __pthread_self();
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if ((m->_m_lock&0x7fffffff) != self->tid)
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return EPERM;
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if ((type&3) == PTHREAD_MUTEX_RECURSIVE && m->_m_count)
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return m->_m_count--, 0;
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if (!priv) {
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self->robust_list.pending = &m->_m_next;
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__vm_lock_impl(+1);
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}
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volatile void *prev = m->_m_prev;
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volatile void *next = m->_m_next;
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*(volatile void *volatile *)prev = next;
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if (next != &self->robust_list.head) *(volatile void *volatile *)
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((char *)next - sizeof(void *)) = prev;
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}
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cont = a_swap(&m->_m_lock, (type & 8) ? 0x40000000 : 0);
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if (type != PTHREAD_MUTEX_NORMAL && !priv) {
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self->robust_list.pending = 0;
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__vm_unlock_impl();
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}
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if (waiters || cont<0)
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__wake(&m->_m_lock, 1, priv);
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return 0;
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}
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weak_alias(__pthread_mutex_unlock, pthread_mutex_unlock);
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