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https://github.com/jart/cosmopolitan.git
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f2af97711b
- Improve compatibility with Blink virtual machine - Add non-POSIX APIs for joining threads and signal masks - Never ever use anything except 32-bit integers for atomics - Add some `#undef` statements to workaround `ctags` problems
104 lines
3.6 KiB
C
104 lines
3.6 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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#include "third_party/nsync/dll.h"
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#define PT_OWNSTACK 1
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#define PT_STATIC 2
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#define PT_ASYNC 4
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#define PT_NOCANCEL 8
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#define PT_MASKED 16
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#define PT_INCANCEL 32
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#define PT_OPENBSD_KLUDGE 64
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#define PT_EXITING 128
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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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 -> kPosixThreadZombie will happen when
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// pthread_detach() 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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int flags; // 0x00: see PT_* constants
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_Atomic(int) cancelled; // 0x04: thread has bad beliefs
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_Atomic(enum PosixThreadStatus) status;
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_Atomic(int) ptid; // transitions 0 → tid
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void *(*start)(void *); // creation callback
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void *arg; // start's parameter
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void *rc; // start's return value
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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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nsync_dll_element_ list; // list of threads
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jmp_buf exiter; // for pthread_exit
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pthread_attr_t attr;
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struct _pthread_cleanup_buffer *cleanup;
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};
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typedef void (*atfork_f)(void);
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extern nsync_dll_list_ _pthread_list;
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extern pthread_spinlock_t _pthread_lock;
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extern _Atomic(pthread_key_dtor) _pthread_key_dtor[PTHREAD_KEYS_MAX] _Hide;
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int _pthread_atfork(atfork_f, atfork_f, atfork_f) _Hide;
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int _pthread_reschedule(struct PosixThread *) _Hide;
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int _pthread_setschedparam_freebsd(int, int, const struct sched_param *) _Hide;
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void _pthread_zombify(struct PosixThread *) _Hide;
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void _pthread_free(struct PosixThread *) _Hide;
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void _pthread_onfork_prepare(void) _Hide;
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void _pthread_onfork_parent(void) _Hide;
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void _pthread_onfork_child(void) _Hide;
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void _pthread_ungarbage(void) _Hide;
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int _pthread_cancel_sys(void) _Hide;
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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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