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60cb435cb4
If threads are being used, then fork() will now acquire and release and runtime locks so that fork() may be safely used from threads. This also makes vfork() thread safe, because pthread mutexes will do nothing when the process is a child of vfork(). More torture tests have been written to confirm this all works like a charm. Additionally: - Invent hexpcpy() api - Rename nsync_malloc_() to kmalloc() - Complete posix named semaphore implementation - Make pthread_create() asynchronous signal safe - Add rm, rmdir, and touch to command interpreter builtins - Invent sigisprecious() and modify sigset functions to use it - Add unit tests for posix_spawn() attributes and fix its bugs One unresolved problem is the reclaiming of *NSYNC waiter memory in the forked child processes, within apps which have threads waiting on locks
109 lines
3.9 KiB
C
109 lines
3.9 KiB
C
#ifndef COSMOPOLITAN_LIBC_THREAD_POSIXTHREAD_INTERNAL_H_
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#define COSMOPOLITAN_LIBC_THREAD_POSIXTHREAD_INTERNAL_H_
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#include "libc/calls/struct/sched_param.h"
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#include "libc/calls/struct/sigset.h"
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#include "libc/runtime/runtime.h"
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#include "libc/thread/thread.h"
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#include "libc/thread/tls.h"
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#define PT_OWNSTACK 1
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#define PT_MAINTHREAD 2
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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/**
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* @fileoverview Cosmopolitan POSIX Thread Internals
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*/
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typedef void (*atfork_f)(void);
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// LEGAL TRANSITIONS ┌──> TERMINATED
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// pthread_create ─┬─> JOINABLE ─┴┬─> DETACHED ──> ZOMBIE
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// └──────────────┘
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enum PosixThreadStatus {
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// this is a running thread that needs pthread_join()
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//
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// the following transitions are possible:
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//
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// - kPosixThreadJoinable -> kPosixThreadTerminated if start_routine()
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// returns, or is longjmp'd out of by pthread_exit(), and the thread
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// is waiting to be joined.
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//
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// - kPosixThreadJoinable -> kPosixThreadDetached if pthread_detach()
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// is called on this thread.
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kPosixThreadJoinable,
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// this is a managed thread that'll be cleaned up by the library.
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//
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// the following transitions are possible:
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//
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// - kPosixThreadDetached -> kPosixThreadZombie if start_routine()
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// returns, or is longjmp'd out of by pthread_exit(), and the thread
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// is waiting to be joined.
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kPosixThreadDetached,
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// this is a joinable thread that terminated.
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//
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// the following transitions are possible:
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//
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// - kPosixThreadTerminated -> _pthread_free() will happen when
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// pthread_join() is called by the user.
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kPosixThreadTerminated,
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// this is a detached thread that terminated.
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//
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// the following transitions are possible:
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//
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// - kPosixThreadZombie -> _pthread_free() will happen whenever
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// convenient, e.g. pthread_create() entry or atexit handler.
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kPosixThreadZombie,
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};
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struct PosixThread {
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_Atomic(enum PosixThreadStatus) status;
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void *(*start_routine)(void *);
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void *arg; // start_routine's parameter
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void *rc; // start_routine's return value
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int tid; // clone parent tid
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int flags; // see PT_* constants
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_Atomic(int) cancelled; // thread has bad beliefs
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char cancelasync; // PTHREAD_CANCEL_DEFERRED/ASYNCHRONOUS
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char canceldisable; // PTHREAD_CANCEL_ENABLE/DISABLE
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char *altstack; // thread sigaltstack
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char *tls; // bottom of tls allocation
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struct CosmoTib *tib; // middle of tls allocation
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jmp_buf exiter; // for pthread_exit
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pthread_attr_t attr;
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sigset_t sigmask;
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struct _pthread_cleanup_buffer *cleanup;
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};
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extern struct PosixThread _pthread_main;
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hidden extern pthread_spinlock_t _pthread_keys_lock;
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hidden extern uint64_t _pthread_key_usage[(PTHREAD_KEYS_MAX + 63) / 64];
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hidden extern pthread_key_dtor _pthread_key_dtor[PTHREAD_KEYS_MAX];
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hidden extern _Thread_local void *_pthread_keys[PTHREAD_KEYS_MAX];
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int _pthread_atfork(atfork_f, atfork_f, atfork_f) hidden;
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int _pthread_reschedule(struct PosixThread *) hidden;
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int _pthread_setschedparam_freebsd(int, int, const struct sched_param *) hidden;
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void _pthread_free(struct PosixThread *) hidden;
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void _pthread_cleanup(struct PosixThread *) hidden;
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void _pthread_ungarbage(void) hidden;
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void _pthread_wait(struct PosixThread *) hidden;
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void _pthread_zombies_add(struct PosixThread *) hidden;
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void _pthread_zombies_purge(void) hidden;
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void _pthread_zombies_decimate(void) hidden;
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void _pthread_zombies_harvest(void) hidden;
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void _pthread_key_destruct(void *[PTHREAD_KEYS_MAX]) hidden;
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void _pthread_key_lock(void) hidden;
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void _pthread_key_unlock(void) hidden;
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void _pthread_onfork_prepare(void) hidden;
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void _pthread_onfork_parent(void) hidden;
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void _pthread_onfork_child(void) hidden;
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_THREAD_POSIXTHREAD_INTERNAL_H_ */
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