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cosmopolitan/libc/thread/thread.h
Justine Tunney 791f79fcb3
Make improvements 
- We now serialize the file descriptor table when spawning / executing
  processes on Windows. This means you can now inherit more stuff than
  just standard i/o. It's needed by bash, which duplicates the console
  to file descriptor #255. We also now do a better job serializing the
  environment variables, so you're less likely to encounter E2BIG when
  using your bash shell. We also no longer coerce environ to uppercase

- execve() on Windows now remotely controls its parent process to make
  them spawn a replacement for itself. Then it'll be able to terminate
  immediately once the spawn succeeds, without having to linger around
  for the lifetime as a shell process for proxying the exit code. When
  process worker thread running in the parent sees the child die, it's
  given a handle to the new child, to replace it in the process table.

- execve() and posix_spawn() on Windows will now provide CreateProcess
  an explicit handle list. This allows us to remove handle locks which
  enables better fork/spawn concurrency, with seriously correct thread
  safety. Other codebases like Go use the same technique. On the other
  hand fork() still favors the conventional WIN32 inheritence approach
  which can be a little bit messy, but is *controlled* by guaranteeing
  perfectly clean slates at both the spawning and execution boundaries

- sigset_t is now 64 bits. Having it be 128 bits was a mistake because
  there's no reason to use that and it's only supported by FreeBSD. By
  using the system word size, signal mask manipulation on Windows goes
  very fast. Furthermore @asyncsignalsafe funcs have been rewritten on
  Windows to take advantage of signal masking, now that it's much more
  pleasant to use.

- All the overlapped i/o code on Windows has been rewritten for pretty
  good signal and cancelation safety. We're now able to ensure overlap
  data structures are cleaned up so long as you don't longjmp() out of
  out of a signal handler that interrupted an i/o operation. Latencies
  are also improved thanks to the removal of lots of "busy wait" code.
  Waits should be optimal for everything except poll(), which shall be
  the last and final demon we slay in the win32 i/o horror show.

- getrusage() on Windows is now able to report RUSAGE_CHILDREN as well
  as RUSAGE_SELF, thanks to aggregation in the process manager thread.
2023-10-08 08:59:53 -07:00

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#ifndef COSMOPOLITAN_LIBC_THREAD_THREAD_H_
#define COSMOPOLITAN_LIBC_THREAD_THREAD_H_
#define PTHREAD_KEYS_MAX 128
#define PTHREAD_STACK_MIN 65536
#define PTHREAD_DESTRUCTOR_ITERATIONS 4
#define PTHREAD_BARRIER_SERIAL_THREAD 31337
#define PTHREAD_MUTEX_DEFAULT 0
#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
#define PTHREAD_PROCESS_PRIVATE 0
#define PTHREAD_PROCESS_SHARED 1
#define PTHREAD_CREATE_JOINABLE 0
#define PTHREAD_CREATE_DETACHED 1
#define PTHREAD_INHERIT_SCHED 0
#define PTHREAD_EXPLICIT_SCHED 1
#define PTHREAD_CANCELED ((void *)-1)
#define PTHREAD_CANCEL_ENABLE 0
#define PTHREAD_CANCEL_DISABLE 1
#define PTHREAD_CANCEL_MASKED 2
#define PTHREAD_CANCEL_DEFERRED 0
#define PTHREAD_CANCEL_ASYNCHRONOUS 1
#define PTHREAD_SCOPE_SYSTEM 0
#define PTHREAD_SCOPE_PROCESS 1
#define PTHREAD_ATTR_NO_SIGMASK_NP -1
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
#define PTHREAD_ONCE_INIT _PTHREAD_INIT
#define PTHREAD_COND_INITIALIZER _PTHREAD_INIT
#define PTHREAD_RWLOCK_INITIALIZER _PTHREAD_INIT
#define PTHREAD_MUTEX_INITIALIZER _PTHREAD_INIT
#define _PTHREAD_INIT \
{ 0 }
typedef uintptr_t pthread_t;
typedef int pthread_id_np_t;
typedef char pthread_condattr_t;
typedef char pthread_rwlockattr_t;
typedef char pthread_barrierattr_t;
typedef unsigned pthread_key_t;
typedef void (*pthread_key_dtor)(void *);
typedef struct pthread_once_s {
_Atomic(uint32_t) _lock;
} pthread_once_t;
typedef struct pthread_spinlock_s {
_Atomic(int) _lock;
} pthread_spinlock_t;
typedef struct pthread_mutex_s {
_Atomic(int32_t) _lock;
unsigned _type : 2;
unsigned _pshared : 1;
unsigned _depth : 6;
unsigned _owner : 23;
long _pid;
} pthread_mutex_t;
typedef struct pthread_mutexattr_s {
char _type;
char _pshared;
} pthread_mutexattr_t;
typedef struct pthread_cond_s {
void *_nsync[2];
} pthread_cond_t;
typedef struct pthread_rwlock_s {
void *_nsync[2];
char _iswrite;
} pthread_rwlock_t;
typedef struct pthread_barrier_s {
void *_nsync;
} pthread_barrier_t;
typedef struct pthread_attr_s {
char __detachstate;
char __inheritsched;
char __havesigmask;
int __schedparam;
int __schedpolicy;
int __contentionscope;
int __guardsize;
size_t __stacksize;
uint64_t __sigmask;
void *__stackaddr;
} pthread_attr_t;
struct _pthread_cleanup_buffer {
void (*__routine)(void *);
void *__arg;
int __canceltype;
struct _pthread_cleanup_buffer *__prev;
};
/* clang-format off */
int pthread_atfork(void (*)(void), void (*)(void), void (*)(void));
int pthread_attr_destroy(pthread_attr_t *) paramsnonnull();
int pthread_attr_getdetachstate(const pthread_attr_t *, int *) paramsnonnull();
int pthread_attr_getguardsize(const pthread_attr_t *, size_t *) paramsnonnull();
int pthread_attr_getinheritsched(const pthread_attr_t *, int *) paramsnonnull();
int pthread_attr_getschedpolicy(const pthread_attr_t *, int *) paramsnonnull();
int pthread_attr_getscope(const pthread_attr_t *, int *) paramsnonnull();
int pthread_attr_getstack(const pthread_attr_t *, void **, size_t *) paramsnonnull();
int pthread_attr_getstacksize(const pthread_attr_t *, size_t *) paramsnonnull();
int pthread_attr_init(pthread_attr_t *) paramsnonnull();
int pthread_attr_setdetachstate(pthread_attr_t *, int) paramsnonnull();
int pthread_attr_setguardsize(pthread_attr_t *, size_t) paramsnonnull();
int pthread_attr_setinheritsched(pthread_attr_t *, int) paramsnonnull();
int pthread_attr_setschedpolicy(pthread_attr_t *, int) paramsnonnull();
int pthread_attr_setscope(pthread_attr_t *, int) paramsnonnull();
int pthread_attr_setstack(pthread_attr_t *, void *, size_t) paramsnonnull((1));
int pthread_attr_setstacksize(pthread_attr_t *, size_t) paramsnonnull();
int pthread_barrier_destroy(pthread_barrier_t *) paramsnonnull();
int pthread_barrier_init(pthread_barrier_t *, const pthread_barrierattr_t *, unsigned) paramsnonnull((1));
int pthread_barrier_wait(pthread_barrier_t *) paramsnonnull();
int pthread_barrierattr_destroy(pthread_barrierattr_t *) paramsnonnull();
int pthread_barrierattr_getpshared(const pthread_barrierattr_t *, int *) paramsnonnull();
int pthread_barrierattr_init(pthread_barrierattr_t *) paramsnonnull();
int pthread_barrierattr_setpshared(pthread_barrierattr_t *, int) paramsnonnull();
int pthread_cancel(pthread_t);
int pthread_cond_broadcast(pthread_cond_t *) paramsnonnull();
int pthread_cond_destroy(pthread_cond_t *) paramsnonnull();
int pthread_cond_init(pthread_cond_t *, const pthread_condattr_t *) paramsnonnull((1));
int pthread_cond_signal(pthread_cond_t *) paramsnonnull();
int pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *) paramsnonnull();
int pthread_condattr_destroy(pthread_condattr_t *) paramsnonnull();
int pthread_condattr_getpshared(const pthread_condattr_t *, int *) paramsnonnull();
int pthread_condattr_init(pthread_condattr_t *) paramsnonnull();
int pthread_condattr_setpshared(pthread_condattr_t *, int) paramsnonnull();
int pthread_create(pthread_t *, const pthread_attr_t *, void *(*)(void *), void *) paramsnonnull((1));
int pthread_detach(pthread_t);
int pthread_equal(pthread_t, pthread_t);
int pthread_getattr_np(pthread_t, pthread_attr_t *) paramsnonnull();
int pthread_getname_np(pthread_t, char *, size_t) paramsnonnull();
int pthread_getunique_np(pthread_t, pthread_id_np_t *) paramsnonnull();
int pthread_join(pthread_t, void **);
int pthread_key_create(pthread_key_t *, pthread_key_dtor) paramsnonnull((1));
int pthread_key_delete(pthread_key_t);
int pthread_kill(pthread_t, int);
int pthread_mutex_consistent(pthread_mutex_t *) paramsnonnull();
int pthread_mutex_destroy(pthread_mutex_t *) paramsnonnull();
int pthread_mutex_init(pthread_mutex_t *, const pthread_mutexattr_t *) paramsnonnull((1));
int pthread_mutex_lock(pthread_mutex_t *) paramsnonnull();
int pthread_mutex_trylock(pthread_mutex_t *) paramsnonnull();
int pthread_mutex_unlock(pthread_mutex_t *) paramsnonnull();
int pthread_mutexattr_destroy(pthread_mutexattr_t *) paramsnonnull();
int pthread_mutexattr_getpshared(const pthread_mutexattr_t *, int *) paramsnonnull();
int pthread_mutexattr_gettype(const pthread_mutexattr_t *, int *) paramsnonnull();
int pthread_mutexattr_init(pthread_mutexattr_t *) paramsnonnull();
int pthread_mutexattr_setpshared(pthread_mutexattr_t *, int) paramsnonnull();
int pthread_mutexattr_settype(pthread_mutexattr_t *, int) paramsnonnull();
int pthread_once(pthread_once_t *, void (*)(void)) paramsnonnull();
int pthread_orphan_np(void);
int pthread_rwlock_destroy(pthread_rwlock_t *) paramsnonnull();
int pthread_rwlock_init(pthread_rwlock_t *, const pthread_rwlockattr_t *) paramsnonnull((1));
int pthread_rwlock_rdlock(pthread_rwlock_t *) paramsnonnull();
int pthread_rwlock_tryrdlock(pthread_rwlock_t *) paramsnonnull();
int pthread_rwlock_trywrlock(pthread_rwlock_t *) paramsnonnull();
int pthread_rwlock_unlock(pthread_rwlock_t *) paramsnonnull();
int pthread_rwlock_wrlock(pthread_rwlock_t *) paramsnonnull();
int pthread_rwlockattr_destroy(pthread_rwlockattr_t *) paramsnonnull();
int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *, int *) paramsnonnull();
int pthread_rwlockattr_init(pthread_rwlockattr_t *) paramsnonnull();
int pthread_rwlockattr_setpshared(pthread_rwlockattr_t *, int) paramsnonnull();
int pthread_setcancelstate(int, int *);
int pthread_setcanceltype(int, int *);
int pthread_setname_np(pthread_t, const char *) paramsnonnull();
int pthread_setschedprio(pthread_t, int);
int pthread_setspecific(pthread_key_t, const void *);
int pthread_spin_destroy(pthread_spinlock_t *) paramsnonnull();
int pthread_spin_init(pthread_spinlock_t *, int) paramsnonnull();
int pthread_spin_lock(pthread_spinlock_t *) paramsnonnull();
int pthread_spin_trylock(pthread_spinlock_t *) paramsnonnull();
int pthread_spin_unlock(pthread_spinlock_t *) paramsnonnull();
int pthread_testcancel_np(void);
int pthread_tryjoin_np(pthread_t, void **);
int pthread_yield(void);
pthread_id_np_t pthread_getthreadid_np(void);
pthread_t pthread_self(void) pureconst;
void *pthread_getspecific(pthread_key_t);
void pthread_cleanup_pop(struct _pthread_cleanup_buffer *, int) paramsnonnull();
void pthread_cleanup_push(struct _pthread_cleanup_buffer *, void (*)(void *), void *) paramsnonnull((1));
void pthread_exit(void *) wontreturn;
void pthread_testcancel(void);
/* clang-format on */
#define pthread_cleanup_push(routine, arg) \
{ \
struct _pthread_cleanup_buffer _buffer; \
pthread_cleanup_push(&_buffer, (routine), (arg));
#define pthread_cleanup_pop(execute) \
pthread_cleanup_pop(&_buffer, (execute)); \
}
#if (__GNUC__ + 0) * 100 + (__GNUC_MINOR__ + 0) >= 407 && \
!defined(__STRICT_ANSI__) && !defined(MODE_DBG)
extern const errno_t EBUSY;
#define pthread_spin_lock(pSpin) \
({ \
pthread_spinlock_t *_s = pSpin; \
while (__atomic_test_and_set(&_s->_lock, __ATOMIC_ACQUIRE)) { \
} \
0; \
})
#define pthread_spin_unlock(pSpin) \
({ \
pthread_spinlock_t *_s = pSpin; \
__atomic_store_n(&_s->_lock, 0, __ATOMIC_RELEASE); \
0; \
})
#define pthread_spin_trylock(pSpin) \
({ \
pthread_spinlock_t *_s = pSpin; \
__atomic_test_and_set(&_s->_lock, __ATOMIC_ACQUIRE) ? EBUSY : 0; \
})
#define pthread_spin_init(pSpin, multiprocess) \
(__atomic_store_n(&(pSpin)->_lock, 0, __ATOMIC_RELAXED), 0)
#define pthread_spin_destroy(pSpin) \
(__atomic_store_n(&(pSpin)->_lock, -1, __ATOMIC_RELAXED), 0)
#endif /* GCC 4.7+ */
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_THREAD_THREAD_H_ */
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