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af7bd80430
This change introduces a new deadlock detector for Cosmo's POSIX threads implementation. Error check mutexes will now track a DAG of nested locks and report EDEADLK when a deadlock is theoretically possible. These will occur rarely, but it's important for production hardening your code. You don't even need to change your mutexes to use the POSIX error check mode because `cosmocc -mdbg` will enable error checking on mutexes by default globally. When cycles are found, an error message showing your demangled symbols describing the strongly connected component are printed and then the SIGTRAP is raised, which means you'll also get a backtrace if you're using ShowCrashReports() too. This new error checker is so low-level and so pure that it's able to verify the relationships of every libc runtime lock, including those locks upon which the mutex implementation depends.
32 lines
1.1 KiB
C
32 lines
1.1 KiB
C
#ifndef COSMOPOLITAN_LIBC_COSMO_H_
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#define COSMOPOLITAN_LIBC_COSMO_H_
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#include "libc/calls/struct/timespec.h"
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COSMOPOLITAN_C_START_
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#ifndef __cplusplus
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#define _COSMO_ATOMIC(x) _Atomic(x)
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#else
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#define _COSMO_ATOMIC(x) x
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#endif
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errno_t cosmo_once(_COSMO_ATOMIC(unsigned) *, void (*)(void)) libcesque;
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int systemvpe(const char *, char *const[], char *const[]) libcesque;
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char *GetProgramExecutableName(void) libcesque;
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void unleaf(void) libcesque;
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int __demangle(char *, const char *, size_t) libcesque;
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int __is_mangled(const char *) libcesque;
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bool32 IsLinuxModern(void) libcesque;
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int LoadZipArgs(int *, char ***) libcesque;
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int cosmo_args(const char *, char ***) libcesque;
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int cosmo_futex_wake(_COSMO_ATOMIC(int) *, int, char);
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int cosmo_futex_wait(_COSMO_ATOMIC(int) *, int, char, int,
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const struct timespec *);
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int __deadlock_check(void *, int) libcesque;
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int __deadlock_tracked(void *) libcesque;
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void __deadlock_record(void *, int) libcesque;
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void __deadlock_track(void *, int) libcesque;
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void __deadlock_untrack(void *) libcesque;
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COSMOPOLITAN_C_END_
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#endif /* COSMOPOLITAN_LIBC_COSMO_H_ */
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