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- 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.
132 lines
4.5 KiB
C
132 lines
4.5 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/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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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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_Atomic(int) pt_futex;
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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_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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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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