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99dc1281f5
The new asynchronous signal delivery technique is now also being used for tkill(), raise(), etc. Many subtle issues have been addresesd. We now signal handling on Windows that's remarkably similar to the POSIX behaviors. However that's just across threads. We're lacking a way to have the signal semantics work well, across multiple WIN32 processes.
107 lines
3.7 KiB
C
107 lines
3.7 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/intrin/dll.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_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_BLOCKED 64
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#define PT_EXITING 128
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#define PT_OPENBSD_KLUDGE 256
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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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#define POSIXTHREAD_CONTAINER(e) DLL_CONTAINER(struct PosixThread, list, e)
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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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struct Dll 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 struct Dll *_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];
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int _pthread_atfork(atfork_f, atfork_f, atfork_f);
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int _pthread_reschedule(struct PosixThread *);
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int _pthread_setschedparam_freebsd(int, int, const struct sched_param *);
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int _pthread_signal(struct PosixThread *, int, int);
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void _pthread_zombify(struct PosixThread *);
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void _pthread_free(struct PosixThread *);
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void _pthread_onfork_prepare(void);
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void _pthread_onfork_parent(void);
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void _pthread_onfork_child(void);
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long _pthread_cancel_sys(void);
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void _pthread_ungarbage(void);
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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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