mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-06-27 06:48:31 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Make improvements to locking

Browse source 
This change makes pthread_mutex_lock() as fast as _spinlock() by
default. Thread instability issues on NetBSD have been resolved.
Improvements made to gdtoa thread code. Crash reporting will now
synchronize between threads in a slightly better way.
This commit is contained in:
Justine Tunney 2022-06-19 01:13:03 -07:00
parent 25041b8026
commit d5312b60f7
60 changed files with 890 additions and 629 deletions
Download patch file Download diff file Expand all files Collapse all files

40
libc/intrin/pthread.h
View file

@ -1,19 +1,21 @@
#ifndef COSMOPOLITAN_LIBC_RUNTIME_PTHREAD_H_
#define COSMOPOLITAN_LIBC_RUNTIME_PTHREAD_H_
#include "libc/bits/atomic.h"
#include "libc/calls/struct/timespec.h"
#include "libc/intrin/kprintf.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
#include "libc/dce.h"
#define PTHREAD_ONCE_INIT 0
#define PTHREAD_MUTEX_DEFAULT PTHREAD_MUTEX_NORMAL
#define PTHREAD_MUTEX_RECURSIVE 0
#define PTHREAD_MUTEX_NORMAL 1
#define PTHREAD_MUTEX_NORMAL 0
#define PTHREAD_MUTEX_RECURSIVE 1
#define PTHREAD_MUTEX_ERRORCHECK 2
#define PTHREAD_MUTEX_STALLED 0
#define PTHREAD_MUTEX_ROBUST 1
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
/* clang-format off */
#define PTHREAD_MUTEX_INITIALIZER {PTHREAD_MUTEX_DEFAULT}
#define PTHREAD_RWLOCK_INITIALIZER {{{0}}}
@ -66,8 +68,8 @@ typedef struct {
} __u;
} pthread_rwlock_t;
wontreturn void pthread_exit(void *);
pureconst pthread_t pthread_self(void);
void pthread_exit(void *) wontreturn;
pthread_t pthread_self(void) pureconst;
int pthread_create(pthread_t *, const pthread_attr_t *, void *(*)(void *),
void *);
int pthread_yield(void);
@ -104,6 +106,30 @@ int pthread_rwlock_trywrlock(pthread_rwlock_t *);
int pthread_rwlock_timedwrlock(pthread_rwlock_t *, const struct timespec *);
int pthread_rwlock_unlock(pthread_rwlock_t *);
#define pthread_mutexattr_init(pAttr) ((pAttr)->attr = PTHREAD_MUTEX_DEFAULT, 0)
#define pthread_mutexattr_destroy(pAttr) ((pAttr)->attr = 0)
#define pthread_mutexattr_gettype(pAttr, pType) (*(pType) = (pAttr)->attr, 0)
#define pthread_mutexattr_settype(pAttr, type) ((pAttr)->attr = type, 0)
#ifdef __GNUC__
#define pthread_mutex_lock(mutex) \
(((mutex)->attr == PTHREAD_MUTEX_NORMAL && \
!atomic_load_explicit(&(mutex)->lock, memory_order_relaxed) && \
!atomic_exchange(&(mutex)->lock, 1)) \
? 0 \
: pthread_mutex_lock(mutex))
#define pthread_mutex_unlock(mutex) \
((mutex)->attr == PTHREAD_MUTEX_NORMAL \
? (atomic_store_explicit(&(mutex)->lock, 0, memory_order_relaxed), \
(IsLinux() && \
atomic_load_explicit(&(mutex)->waits, memory_order_relaxed) && \
_pthread_mutex_wake(mutex)), \
0) \
: pthread_mutex_unlock(mutex))
#endif
int _pthread_mutex_wake(pthread_mutex_t *) hidden;
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_RUNTIME_PTHREAD_H_ */