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add support for SIGEV_THREAD_ID timers 

This is like SIGEV_SIGNAL, but targeted to a particular thread's
tid, rather than the process.
This commit is contained in:
James Y Knight 2019-06-30 21:55:20 -04:00 committed by Rich Felker
parent f70375df85
commit 7c71792e87
2 changed files with 19 additions and 5 deletions
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16
include/signal.h
View File

@ -180,14 +180,24 @@ struct sigevent {
union sigval sigev_value;
int sigev_signo;
int sigev_notify;
void (*sigev_notify_function)(union sigval);
pthread_attr_t *sigev_notify_attributes;
char __pad[56-3*sizeof(long)];
union {
char __pad[64 - 2*sizeof(int) - sizeof(union sigval)];
pid_t sigev_notify_thread_id;
struct {
void (*sigev_notify_function)(union sigval);
pthread_attr_t *sigev_notify_attributes;
} __sev_thread;
} __sev_fields;
};
#define sigev_notify_thread_id __sev_fields.sigev_notify_thread_id
#define sigev_notify_function __sev_fields.__sev_thread.sigev_notify_function
#define sigev_notify_attributes __sev_fields.__sev_thread.sigev_notify_attributes
#define SIGEV_SIGNAL 0
#define SIGEV_NONE 1
#define SIGEV_THREAD 2
#define SIGEV_THREAD_ID 4
int __libc_current_sigrtmin(void);
int __libc_current_sigrtmax(void);

8
src/time/timer_create.c
View File

@ -71,11 +71,15 @@ int timer_create(clockid_t clk, struct sigevent *restrict evp, timer_t *restrict
switch (evp ? evp->sigev_notify : SIGEV_SIGNAL) {
case SIGEV_NONE:
case SIGEV_SIGNAL:
case SIGEV_THREAD_ID:
if (evp) {
ksev.sigev_value = evp->sigev_value;
ksev.sigev_signo = evp->sigev_signo;
ksev.sigev_notify = evp->sigev_notify;
ksev.sigev_tid = 0;
if (evp->sigev_notify == SIGEV_THREAD_ID)
ksev.sigev_tid = evp->sigev_notify_thread_id;
else
ksev.sigev_tid = 0;
ksevp = &ksev;
}
if (syscall(SYS_timer_create, clk, ksevp, &timerid) < 0)
@ -107,7 +111,7 @@ int timer_create(clockid_t clk, struct sigevent *restrict evp, timer_t *restrict
ksev.sigev_value.sival_ptr = 0;
ksev.sigev_signo = SIGTIMER;
ksev.sigev_notify = 4; /* SIGEV_THREAD_ID */
ksev.sigev_notify = SIGEV_THREAD_ID;
ksev.sigev_tid = td->tid;
if (syscall(SYS_timer_create, clk, &ksev, &timerid) < 0)
timerid = -1;