mirror of
https://github.com/jart/cosmopolitan.git
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2278327eba
This change makes some miracle modifications to the System Five system call support, which lets us have safe, correct, and atomic handling of thread cancellations. It all turned out to be cheaper than anticipated because it wasn't necessary to modify the system call veneers. We were able to encode the cancellability of each system call into the magnums found in libc/sysv/syscalls.sh. Since cancellations are so waq, we are also supporting a lovely Musl Libc mask feature for raising ECANCELED.
238 lines
8.8 KiB
C
238 lines
8.8 KiB
C
#ifndef COSMOPOLITAN_LIBC_THREAD_THREAD_H_
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#define COSMOPOLITAN_LIBC_THREAD_THREAD_H_
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#define PTHREAD_KEYS_MAX 128
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#define PTHREAD_STACK_MIN FRAMESIZE
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#define PTHREAD_DESTRUCTOR_ITERATIONS 4
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#define PTHREAD_BARRIER_SERIAL_THREAD 31337
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#define PTHREAD_MUTEX_DEFAULT 0
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#define PTHREAD_MUTEX_NORMAL 0
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#define PTHREAD_MUTEX_RECURSIVE 1
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#define PTHREAD_MUTEX_ERRORCHECK 2
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#define PTHREAD_MUTEX_STALLED 0
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#define PTHREAD_MUTEX_ROBUST 1
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#define PTHREAD_PROCESS_PRIVATE 0
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#define PTHREAD_PROCESS_SHARED 1
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#define PTHREAD_CREATE_JOINABLE 0
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#define PTHREAD_CREATE_DETACHED 1
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#define PTHREAD_INHERIT_SCHED 0
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#define PTHREAD_EXPLICIT_SCHED 1
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#define PTHREAD_CANCELED ((void *)-1)
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#define PTHREAD_CANCEL_ENABLE 0
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#define PTHREAD_CANCEL_DISABLE 1
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#define PTHREAD_CANCEL_MASKED 2
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#define PTHREAD_CANCEL_DEFERRED 0
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#define PTHREAD_CANCEL_ASYNCHRONOUS 1
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#define PTHREAD_SCOPE_SYSTEM 0
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#define PTHREAD_SCOPE_PROCESS 1
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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#define PTHREAD_ONCE_INIT _PTHREAD_INIT
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#define PTHREAD_COND_INITIALIZER _PTHREAD_INIT
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#define PTHREAD_RWLOCK_INITIALIZER _PTHREAD_INIT
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#define PTHREAD_MUTEX_INITIALIZER _PTHREAD_INIT
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#define _PTHREAD_INIT \
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{ 0 }
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typedef uintptr_t pthread_t;
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typedef int pthread_id_np_t;
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typedef char pthread_condattr_t;
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typedef char pthread_rwlockattr_t;
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typedef char pthread_barrierattr_t;
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typedef unsigned pthread_key_t;
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typedef void (*pthread_key_dtor)(void *);
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typedef struct pthread_once_s {
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_Atomic(uint32_t) _lock;
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} pthread_once_t;
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typedef struct pthread_spinlock_s {
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_Atomic(char) _lock;
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} pthread_spinlock_t;
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typedef struct pthread_mutex_s {
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_Atomic(int32_t) _lock;
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unsigned _type : 2;
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unsigned _pshared : 1;
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unsigned _depth : 8;
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unsigned _owner : 21;
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long _pid;
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} pthread_mutex_t;
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typedef struct pthread_mutexattr_s {
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char _type;
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char _pshared;
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} pthread_mutexattr_t;
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typedef struct pthread_cond_s {
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void *_nsync[2];
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} pthread_cond_t;
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typedef struct pthread_rwlock_s {
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void *_nsync[2];
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char _iswrite;
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} pthread_rwlock_t;
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typedef struct pthread_barrier_s {
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void *_nsync;
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} pthread_barrier_t;
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typedef struct pthread_attr_s {
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char __detachstate;
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char __inheritsched;
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int __schedparam;
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int __schedpolicy;
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int __contentionscope;
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unsigned __guardsize;
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unsigned __stacksize;
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char *__stackaddr;
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} pthread_attr_t;
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struct _pthread_cleanup_buffer {
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void (*__routine)(void *);
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void *__arg;
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int __canceltype;
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struct _pthread_cleanup_buffer *__prev;
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};
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int pthread_create(pthread_t *, const pthread_attr_t *, void *(*)(void *),
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void *);
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int pthread_yield(void);
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void pthread_testcancel(void);
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int pthread_testcancel_np(void);
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void pthread_exit(void *) wontreturn;
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pthread_t pthread_self(void) pureconst;
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pthread_id_np_t pthread_getthreadid_np(void);
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int64_t pthread_getunique_np(pthread_t);
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int pthread_setname_np(pthread_t, const char *);
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int pthread_getname_np(pthread_t, char *, size_t);
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int pthread_getattr_np(pthread_t, pthread_attr_t *);
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int pthread_attr_init(pthread_attr_t *);
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int pthread_attr_destroy(pthread_attr_t *);
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int pthread_attr_getdetachstate(const pthread_attr_t *, int *);
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int pthread_attr_setdetachstate(pthread_attr_t *, int);
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int pthread_attr_getguardsize(const pthread_attr_t *, size_t *);
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int pthread_attr_setguardsize(pthread_attr_t *, size_t);
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int pthread_attr_getinheritsched(const pthread_attr_t *, int *);
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int pthread_attr_setinheritsched(pthread_attr_t *, int);
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int pthread_attr_getschedpolicy(const pthread_attr_t *, int *);
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int pthread_attr_setschedpolicy(pthread_attr_t *, int);
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int pthread_attr_getscope(const pthread_attr_t *, int *);
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int pthread_attr_setscope(pthread_attr_t *, int);
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int pthread_attr_getstack(const pthread_attr_t *, void **, size_t *);
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int pthread_attr_setstack(pthread_attr_t *, void *, size_t);
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int pthread_attr_getstacksize(const pthread_attr_t *, size_t *);
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int pthread_attr_setstacksize(pthread_attr_t *, size_t);
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int pthread_detach(pthread_t);
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int pthread_kill(pthread_t, int);
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int pthread_cancel(pthread_t);
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int pthread_setcanceltype(int, int *);
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int pthread_setcancelstate(int, int *);
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int pthread_setschedprio(pthread_t, int);
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int pthread_join(pthread_t, void **);
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int pthread_equal(pthread_t, pthread_t);
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int pthread_once(pthread_once_t *, void (*)(void));
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int pthread_spin_init(pthread_spinlock_t *, int);
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int pthread_spin_destroy(pthread_spinlock_t *);
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int pthread_spin_lock(pthread_spinlock_t *);
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int pthread_spin_unlock(pthread_spinlock_t *);
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int pthread_spin_trylock(pthread_spinlock_t *);
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int pthread_mutexattr_init(pthread_mutexattr_t *);
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int pthread_mutexattr_destroy(pthread_mutexattr_t *);
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int pthread_mutexattr_gettype(const pthread_mutexattr_t *, int *);
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int pthread_mutexattr_settype(pthread_mutexattr_t *, int);
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int pthread_mutexattr_setpshared(pthread_mutexattr_t *, int);
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int pthread_mutexattr_getpshared(const pthread_mutexattr_t *, int *);
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int pthread_atfork(void (*)(void), void (*)(void), void (*)(void));
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int pthread_mutex_init(pthread_mutex_t *, const pthread_mutexattr_t *);
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int pthread_mutex_lock(pthread_mutex_t *);
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int pthread_mutex_unlock(pthread_mutex_t *);
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int pthread_mutex_trylock(pthread_mutex_t *);
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int pthread_mutex_destroy(pthread_mutex_t *);
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int pthread_mutex_consistent(pthread_mutex_t *);
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int pthread_condattr_init(pthread_condattr_t *);
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int pthread_condattr_destroy(pthread_condattr_t *);
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int pthread_condattr_setpshared(pthread_condattr_t *, int);
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int pthread_condattr_getpshared(const pthread_condattr_t *, int *);
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int pthread_cond_init(pthread_cond_t *, const pthread_condattr_t *);
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int pthread_cond_destroy(pthread_cond_t *);
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int pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *);
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int pthread_cond_broadcast(pthread_cond_t *);
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int pthread_cond_signal(pthread_cond_t *);
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int pthread_rwlockattr_init(pthread_rwlockattr_t *);
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int pthread_rwlockattr_destroy(pthread_rwlockattr_t *);
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int pthread_rwlockattr_setpshared(pthread_rwlockattr_t *, int);
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int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *, int *);
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int pthread_rwlock_init(pthread_rwlock_t *, const pthread_rwlockattr_t *);
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int pthread_rwlock_destroy(pthread_rwlock_t *);
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int pthread_rwlock_rdlock(pthread_rwlock_t *);
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int pthread_rwlock_tryrdlock(pthread_rwlock_t *);
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int pthread_rwlock_wrlock(pthread_rwlock_t *);
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int pthread_rwlock_trywrlock(pthread_rwlock_t *);
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int pthread_rwlock_unlock(pthread_rwlock_t *);
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int pthread_key_create(pthread_key_t *, pthread_key_dtor);
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int pthread_key_delete(pthread_key_t);
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int pthread_setspecific(pthread_key_t, const void *);
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void *pthread_getspecific(pthread_key_t);
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int pthread_barrierattr_init(pthread_barrierattr_t *);
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int pthread_barrierattr_destroy(pthread_barrierattr_t *);
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int pthread_barrierattr_getpshared(const pthread_barrierattr_t *, int *);
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int pthread_barrierattr_setpshared(pthread_barrierattr_t *, int);
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int pthread_barrier_wait(pthread_barrier_t *);
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int pthread_barrier_destroy(pthread_barrier_t *);
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int pthread_barrier_init(pthread_barrier_t *, const pthread_barrierattr_t *,
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unsigned);
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void _pthread_cleanup_pop(struct _pthread_cleanup_buffer *, int);
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void _pthread_cleanup_push(struct _pthread_cleanup_buffer *, void (*)(void *),
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void *);
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#define pthread_cleanup_push(routine, arg) \
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{ \
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struct _pthread_cleanup_buffer _buffer; \
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_pthread_cleanup_push(&_buffer, (routine), (arg));
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#define pthread_cleanup_pop(execute) \
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_pthread_cleanup_pop(&_buffer, (execute)); \
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}
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#if (__GNUC__ + 0) * 100 + (__GNUC_MINOR__ + 0) >= 407 && \
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!defined(__STRICT_ANSI__)
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extern const errno_t EBUSY;
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#define pthread_spin_lock(pSpin) \
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({ \
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pthread_spinlock_t *_s = pSpin; \
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while (__atomic_test_and_set(&_s->_lock, __ATOMIC_ACQUIRE)) donothing; \
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0; \
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})
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#define pthread_spin_unlock(pSpin) \
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({ \
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pthread_spinlock_t *_s = pSpin; \
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__atomic_store_n(&_s->_lock, 0, __ATOMIC_RELEASE); \
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0; \
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})
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#define pthread_spin_trylock(pSpin) \
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({ \
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pthread_spinlock_t *_s = pSpin; \
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__atomic_test_and_set(&_s->_lock, __ATOMIC_ACQUIRE) ? EBUSY : 0; \
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})
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#define pthread_spin_init(pSpin, multiprocess) \
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(__atomic_store_n(&(pSpin)->_lock, 0, __ATOMIC_RELAXED), 0)
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#define pthread_spin_destroy(pSpin) \
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(__atomic_store_n(&(pSpin)->_lock, -1, __ATOMIC_RELAXED), 0)
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#endif /* GCC 4.7+ */
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_THREAD_THREAD_H_ */
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