mirror of
https://github.com/jart/cosmopolitan.git
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2db2f40a98
This change gets GNU grep working. What caused it to not work, is it wouldn't write to an output file descriptor when its dev/ino equaled /dev/null's. So now we invent special dev/ino values for these files
138 lines
4.7 KiB
C
138 lines
4.7 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/sigaltstack.h"
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#include "libc/intrin/atomic.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_RESTARTABLE 64
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#define PT_OPENBSD_KLUDGE 128
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#define PT_BLOCKER_CPU ((atomic_int *)-0)
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#define PT_BLOCKER_SEM ((atomic_int *)-1)
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#define PT_BLOCKER_IO ((atomic_int *)-2)
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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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//
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// - kPosixThreadJoinable -> kPosixThreadZombie if another thread
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// calls fork().
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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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//
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// - kPosixThreadDetached -> kPosixThreadZombie if another thread
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// calls fork().
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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 -> kPosixThreadZombie if another thread
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// calls fork().
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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 pt_flags; // 0x00: see PT_* constants
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atomic_int pt_canceled; // 0x04: thread has bad beliefs
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_Atomic(enum PosixThreadStatus) pt_status;
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atomic_int ptid; // transitions 0 → tid
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atomic_int pt_refs; // negative means free
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void *(*pt_start)(void *); // creation callback
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void *pt_arg; // start's parameter
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void *pt_rc; // start's return value
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char *pt_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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struct _pthread_cleanup_buffer *pt_cleanup;
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_Atomic(atomic_int *) pt_blocker;
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int64_t pt_semaphore;
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intptr_t pt_iohandle;
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void *pt_ioverlap;
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jmp_buf pt_exiter;
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pthread_attr_t pt_attr;
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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 struct PosixThread _pthread_static;
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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_tid(struct PosixThread *);
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intptr_t _pthread_syshand(struct PosixThread *);
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long _pthread_cancel_ack(void);
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void _pthread_decimate(void);
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void _pthread_free(struct PosixThread *, bool);
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void _pthread_lock(void);
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void _pthread_onfork_child(void);
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void _pthread_onfork_parent(void);
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void _pthread_onfork_prepare(void);
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void _pthread_ungarbage(void);
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void _pthread_unkey(struct CosmoTib *);
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void _pthread_unlock(void);
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void _pthread_unref(struct PosixThread *);
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void _pthread_unwind(struct PosixThread *);
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void _pthread_zombify(struct PosixThread *);
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__funline pureconst struct PosixThread *_pthread_self(void) {
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return (struct PosixThread *)__get_tls()->tib_pthread;
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}
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__funline void _pthread_ref(struct PosixThread *pt) {
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atomic_fetch_add_explicit(&pt->pt_refs, 1, memory_order_relaxed);
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}
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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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