mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-12 09:17:53 +00:00
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.
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
#ifndef COSMOPOLITAN_LIBC_PROC_H_
|
|
#define COSMOPOLITAN_LIBC_PROC_H_
|
|
#include "libc/atomic.h"
|
|
#include "libc/calls/struct/rusage.h"
|
|
#include "libc/intrin/atomic.h"
|
|
#include "libc/intrin/dll.h"
|
|
#include "libc/thread/thread.h"
|
|
COSMOPOLITAN_C_START_
|
|
|
|
#define PROC_ALIVE 0
|
|
#define PROC_ZOMBIE 1
|
|
#define PROC_UNDEAD 2
|
|
|
|
#define PROC_CONTAINER(e) DLL_CONTAINER(struct Proc, elem, e)
|
|
|
|
struct Proc {
|
|
int pid;
|
|
int status;
|
|
int waiters;
|
|
bool wasforked;
|
|
uint32_t wstatus;
|
|
int64_t handle;
|
|
struct Dll elem;
|
|
struct rusage ru;
|
|
};
|
|
|
|
struct Procs {
|
|
int waiters;
|
|
atomic_uint once;
|
|
pthread_mutex_t lock;
|
|
intptr_t thread;
|
|
intptr_t onbirth;
|
|
intptr_t haszombies;
|
|
struct Dll *list;
|
|
struct Dll *free;
|
|
struct Dll *undead;
|
|
struct Dll *zombies;
|
|
unsigned allocated;
|
|
struct rusage ruchlds;
|
|
};
|
|
|
|
extern struct Procs __proc;
|
|
|
|
void __proc_wipe(void) libcesque;
|
|
void __proc_lock(void) libcesque;
|
|
void __proc_unlock(void) libcesque;
|
|
int64_t __proc_handle(int) libcesque;
|
|
int64_t __proc_search(int) libcesque;
|
|
struct Proc *__proc_new(void) libcesque;
|
|
void __proc_add(struct Proc *) libcesque;
|
|
void __proc_free(struct Proc *) libcesque;
|
|
int __proc_harvest(struct Proc *, bool) libcesque;
|
|
int sys_wait4_nt(int, int *, int, struct rusage *) libcesque;
|
|
|
|
COSMOPOLITAN_C_END_
|
|
#endif /* COSMOPOLITAN_LIBC_PROC_H_ */
|