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Refactor internal-signals.h
The main drive is to optimize the internal usage and required size when sigset_t is embedded in other data structures. On Linux, the current supported signal set requires up to 8 bytes (16 on mips), was lower than the user defined sigset_t (128 bytes). A new internal type internal_sigset_t is added, along with the functions to operate on it similar to the ones for sigset_t. The internal-signals.h is also refactored to remove unused functions Besides small stack usage on some functions (posix_spawn, abort) it lower the struct pthread by about 120 bytes (112 on mips). Checked on x86_64-linux-gnu. Reviewed-by: Arjun Shankar <arjun@redhat.com>
This commit is contained in:
parent
c22d2021a9
commit
a1bdd81664
@ -35,6 +35,7 @@
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#include <kernel-features.h>
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#include <tls-internal-struct.h>
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#include <sys/rseq.h>
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#include <internal-sigset.h>
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#ifndef TCB_ALIGNMENT
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# define TCB_ALIGNMENT 32
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@ -387,7 +388,7 @@ struct pthread
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/* Signal mask for the new thread. Used during thread startup to
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restore the signal mask. (Threads are launched with all signals
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masked.) */
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sigset_t sigmask;
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internal_sigset_t sigmask;
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/* Indicates whether is a C11 thread created by thrd_creat. */
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bool c11;
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@ -28,7 +28,7 @@ pthread_attr_setsigmask_np (pthread_attr_t *attr, const sigset_t *sigmask)
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/* Filter out internal signals. */
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struct pthread_attr *iattr = (struct pthread_attr *) attr;
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__clear_internal_signals (&iattr->extension->sigmask);
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clear_internal_signals (&iattr->extension->sigmask);
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return 0;
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}
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@ -423,7 +423,7 @@ start_thread (void *arg)
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/* Store the new cleanup handler info. */
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THREAD_SETMEM (pd, cleanup_jmp_buf, &unwind_buf);
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__libc_signal_restore_set (&pd->sigmask);
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internal_signal_restore_set (&pd->sigmask);
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LIBC_PROBE (pthread_start, 3, (pthread_t) pd, pd->start_routine, pd->arg);
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@ -501,8 +501,8 @@ start_thread (void *arg)
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signal to be delivered. (SIGSETXID cannot run application code,
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nor does it use pthread_kill.) Reuse the pd->sigmask space for
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computing the signal mask, to save stack space. */
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__sigfillset (&pd->sigmask);
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__sigdelset (&pd->sigmask, SIGSETXID);
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internal_sigfillset (&pd->sigmask);
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internal_sigdelset (&pd->sigmask, SIGSETXID);
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INTERNAL_SYSCALL_CALL (rt_sigprocmask, SIG_BLOCK, &pd->sigmask, NULL,
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__NSIG_BYTES);
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@ -769,14 +769,14 @@ __pthread_create_2_1 (pthread_t *newthread, const pthread_attr_t *attr,
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/* Block all signals, so that the new thread starts out with
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signals disabled. This avoids race conditions in the thread
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startup. */
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sigset_t original_sigmask;
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__libc_signal_block_all (&original_sigmask);
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internal_sigset_t original_sigmask;
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internal_signal_block_all (&original_sigmask);
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if (iattr->extension != NULL && iattr->extension->sigmask_set)
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/* Use the signal mask in the attribute. The internal signals
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have already been filtered by the public
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pthread_attr_setsigmask_np interface. */
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pd->sigmask = iattr->extension->sigmask;
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internal_sigset_from_sigset (&pd->sigmask, &iattr->extension->sigmask);
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else
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{
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/* Conceptually, the new thread needs to inherit the signal mask
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@ -786,7 +786,7 @@ __pthread_create_2_1 (pthread_t *newthread, const pthread_attr_t *attr,
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pd->sigmask = original_sigmask;
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/* Reset the cancellation signal mask in case this thread is
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running cancellation. */
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__sigdelset (&pd->sigmask, SIGCANCEL);
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internal_sigdelset (&pd->sigmask, SIGCANCEL);
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}
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/* Start the thread. */
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@ -833,7 +833,7 @@ __pthread_create_2_1 (pthread_t *newthread, const pthread_attr_t *attr,
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/* Return to the previous signal mask, after creating the new
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thread. */
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__libc_signal_restore_set (&original_sigmask);
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internal_signal_restore_set (&original_sigmask);
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if (__glibc_unlikely (retval != 0))
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{
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@ -45,8 +45,8 @@ __pthread_kill_implementation (pthread_t threadid, int signo, int no_tid)
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}
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/* Block all signals, as required by pd->exit_lock. */
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sigset_t old_mask;
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__libc_signal_block_all (&old_mask);
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internal_sigset_t old_mask;
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internal_signal_block_all (&old_mask);
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__libc_lock_lock (pd->exit_lock);
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int ret;
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@ -64,7 +64,7 @@ __pthread_kill_implementation (pthread_t threadid, int signo, int no_tid)
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}
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__libc_lock_unlock (pd->exit_lock);
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__libc_signal_restore_set (&old_mask);
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internal_signal_restore_set (&old_mask);
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return ret;
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}
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@ -83,7 +83,7 @@ __pthread_kill (pthread_t threadid, int signo)
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{
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/* Disallow sending the signal we use for cancellation, timers,
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for the setxid implementation. */
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if (__is_internal_signal (signo))
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if (is_internal_signal (signo))
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return EINVAL;
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return __pthread_kill_internal (threadid, signo);
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@ -102,7 +102,7 @@ int
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attribute_compat_text_section
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__pthread_kill_esrch (pthread_t threadid, int signo)
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{
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if (__is_internal_signal (signo))
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if (is_internal_signal (signo))
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return EINVAL;
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return __pthread_kill_implementation (threadid, signo, ESRCH);
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@ -32,7 +32,7 @@ __pthread_sigmask (int how, const sigset_t *newmask, sigset_t *oldmask)
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|| __glibc_unlikely (__sigismember (newmask, SIGSETXID))))
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{
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local_newmask = *newmask;
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__clear_internal_signals (&local_newmask);
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clear_internal_signals (&local_newmask);
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newmask = &local_newmask;
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}
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@ -43,7 +43,7 @@ thread_handler (union sigval sv)
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if (sigismember (&ss, sig))
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{
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TEST_VERIFY (sig != SIGKILL && sig != SIGSTOP);
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TEST_VERIFY (!__is_internal_signal (sig));
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TEST_VERIFY (!is_internal_signal (sig));
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}
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if (test_verbose && sigismember (&ss, sig))
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printf ("%d, ", sig);
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@ -24,7 +24,7 @@
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int
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__sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
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{
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if (sig <= 0 || sig >= NSIG || __is_internal_signal (sig))
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if (sig <= 0 || sig >= NSIG || is_internal_signal (sig))
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{
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__set_errno (EINVAL);
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return -1;
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@ -25,7 +25,7 @@ int
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sigaddset (sigset_t *set, int signo)
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{
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if (set == NULL || signo <= 0 || signo >= NSIG
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|| __is_internal_signal (signo))
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|| is_internal_signal (signo))
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{
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__set_errno (EINVAL);
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return -1;
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@ -25,7 +25,7 @@ int
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sigdelset (sigset_t *set, int signo)
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{
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if (set == NULL || signo <= 0 || signo >= NSIG
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|| __is_internal_signal (signo))
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|| is_internal_signal (signo))
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{
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__set_errno (EINVAL);
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return -1;
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@ -31,7 +31,7 @@ sigfillset (sigset_t *set)
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}
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__sigfillset (set);
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__clear_internal_signals (set);
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clear_internal_signals (set);
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return 0;
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}
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libc_hidden_def (sigfillset)
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@ -21,7 +21,7 @@
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sigsetops.h>
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#include <internal-signals.h>
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/* Try to get a machine dependent instruction which will make the
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program crash. This is used in case everything else fails. */
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@ -48,7 +48,6 @@ void
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abort (void)
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{
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struct sigaction act;
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sigset_t sigs;
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/* First acquire the lock. */
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__libc_lock_lock_recursive (lock);
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@ -59,9 +58,10 @@ abort (void)
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if (stage == 0)
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{
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++stage;
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__sigemptyset (&sigs);
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__sigaddset (&sigs, SIGABRT);
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__sigprocmask (SIG_UNBLOCK, &sigs, 0);
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internal_sigset_t sigs;
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internal_sigemptyset (&sigs);
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internal_sigaddset (&sigs, SIGABRT);
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internal_sigprocmask (SIG_UNBLOCK, &sigs, NULL);
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}
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/* Send signal which possibly calls a user handler. */
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@ -29,39 +29,20 @@
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#define RESERVED_SIGRT 0
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static inline bool
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__is_internal_signal (int sig)
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is_internal_signal (int sig)
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{
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return false;
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}
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static inline void
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__clear_internal_signals (sigset_t *set)
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clear_internal_signals (sigset_t *set)
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{
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}
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static inline void
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__libc_signal_block_all (sigset_t *set)
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{
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sigset_t allset;
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__sigfillset (&allset);
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__sigprocmask (SIG_BLOCK, &allset, set);
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}
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static inline void
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__libc_signal_block_app (sigset_t *set)
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{
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sigset_t allset;
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__sigfillset (&allset);
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__clear_internal_signals (&allset);
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__sigprocmask (SIG_BLOCK, &allset, set);
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}
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/* Restore current process signal mask. */
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static inline void
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__libc_signal_restore_set (const sigset_t *set)
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{
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__sigprocmask (SIG_SETMASK, set, NULL);
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}
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typedef sigset_t internal_sigset_t;
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#define internal_sigemptyset(__s) sigemptyset (__s)
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#define internal_sigaddset(__s, __i) sigaddset (__s, __i)
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#define internal_sigprocmask(__h, __s, __o) sigprocmask (__h, __s, __o)
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#endif /* __INTERNAL_SIGNALS_H */
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@ -32,7 +32,7 @@ __bsd_signal (int sig, __sighandler_t handler)
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/* Check signal extents to protect __sigismember. */
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if (handler == SIG_ERR || sig < 1 || sig >= NSIG
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|| __is_internal_signal (sig))
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|| is_internal_signal (sig))
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{
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__set_errno (EINVAL);
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return SIG_ERR;
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@ -34,7 +34,7 @@ __libc_unwind_longjmp (sigjmp_buf env, int val)
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if (env[0].__mask_was_saved)
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/* Restore the saved signal mask. */
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__libc_signal_restore_set (&env[0].__saved_mask);
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__sigprocmask (SIG_SETMASK, &env[0].__saved_mask, NULL);
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/* Call the machine-dependent function to restore machine state. */
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__sigstack_longjmp (env[0].__jmpbuf, val ?: 1);
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@ -19,10 +19,11 @@
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#ifndef __INTERNAL_SIGNALS_H
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# define __INTERNAL_SIGNALS_H
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#include <internal-sigset.h>
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#include <limits.h>
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#include <signal.h>
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#include <sigsetops.h>
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#include <stdbool.h>
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#include <limits.h>
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#include <stddef.h>
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#include <sysdep.h>
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@ -47,67 +48,63 @@
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/* Return is sig is used internally. */
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static inline bool
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__is_internal_signal (int sig)
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is_internal_signal (int sig)
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{
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return (sig == SIGCANCEL) || (sig == SIGSETXID);
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}
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/* Remove internal glibc signal from the mask. */
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static inline void
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__clear_internal_signals (sigset_t *set)
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clear_internal_signals (sigset_t *set)
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{
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__sigdelset (set, SIGCANCEL);
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__sigdelset (set, SIGSETXID);
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}
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static const sigset_t sigall_set = {
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.__val = {[0 ... _SIGSET_NWORDS-1 ] = -1 }
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static const internal_sigset_t sigall_set = {
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.__val = {[0 ... __NSIG_WORDS-1 ] = -1 }
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};
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static const sigset_t sigtimer_set = {
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.__val = { [0] = __sigmask (SIGTIMER),
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[1 ... _SIGSET_NWORDS-1] = 0 }
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};
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/* Obtain and change blocked signals, including internal glibc ones. */
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static inline int
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internal_sigprocmask (int how, const internal_sigset_t *set,
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internal_sigset_t *oldset)
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{
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return INTERNAL_SYSCALL_CALL (rt_sigprocmask, how, set, oldset,
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__NSIG_BYTES);
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}
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/* Block all signals, including internal glibc ones. */
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static inline void
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__libc_signal_block_all (sigset_t *set)
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internal_signal_block_all (internal_sigset_t *oset)
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{
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INTERNAL_SYSCALL_CALL (rt_sigprocmask, SIG_BLOCK, &sigall_set, set,
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__NSIG_BYTES);
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}
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/* Block all application signals (excluding internal glibc ones). */
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static inline void
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__libc_signal_block_app (sigset_t *set)
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{
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sigset_t allset = sigall_set;
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__clear_internal_signals (&allset);
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INTERNAL_SYSCALL_CALL (rt_sigprocmask, SIG_BLOCK, &allset, set,
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__NSIG_BYTES);
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}
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/* Block only SIGTIMER and return the previous set on SET. */
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static inline void
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__libc_signal_block_sigtimer (sigset_t *set)
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{
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INTERNAL_SYSCALL_CALL (rt_sigprocmask, SIG_BLOCK, &sigtimer_set, set,
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__NSIG_BYTES);
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}
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/* Unblock only SIGTIMER and return the previous set on SET. */
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static inline void
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__libc_signal_unblock_sigtimer (sigset_t *set)
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{
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INTERNAL_SYSCALL_CALL (rt_sigprocmask, SIG_UNBLOCK, &sigtimer_set, set,
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INTERNAL_SYSCALL_CALL (rt_sigprocmask, SIG_BLOCK, &sigall_set, oset,
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__NSIG_BYTES);
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}
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/* Restore current process signal mask. */
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static inline void
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__libc_signal_restore_set (const sigset_t *set)
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internal_signal_restore_set (const internal_sigset_t *set)
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{
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INTERNAL_SYSCALL_CALL (rt_sigprocmask, SIG_SETMASK, set, NULL,
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__NSIG_BYTES);
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}
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/* It is used on timer_create code directly on sigwaitinfo call, so it can not
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use the internal_sigset_t definitions. */
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static const sigset_t sigtimer_set = {
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.__val = { [0] = __sigmask (SIGTIMER),
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[1 ... _SIGSET_NWORDS-1] = 0
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}
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};
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/* Unblock only SIGTIMER. */
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static inline void
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signal_unblock_sigtimer (void)
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{
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INTERNAL_SYSCALL_CALL (rt_sigprocmask, SIG_UNBLOCK, &sigtimer_set, NULL,
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__NSIG_BYTES);
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}
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#endif
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105
sysdeps/unix/sysv/linux/internal-sigset.h
Normal file
105
sysdeps/unix/sysv/linux/internal-sigset.h
Normal file
@ -0,0 +1,105 @@
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/* Internal sigset_t definition.
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _INTERNAL_SIGSET_H
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#define _INTERNAL_SIGSET_H
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#include <sigsetops.h>
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typedef struct
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{
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unsigned long int __val[__NSIG_WORDS];
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} internal_sigset_t;
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static inline void
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internal_sigset_from_sigset (internal_sigset_t *iset, const sigset_t *set)
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{
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int cnt = __NSIG_WORDS;
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while (--cnt >= 0)
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iset->__val[cnt] = set->__val[cnt];
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}
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static inline void
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internal_sigemptyset (internal_sigset_t *set)
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{
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int cnt = __NSIG_WORDS;
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while (--cnt >= 0)
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set->__val[cnt] = 0;
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}
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static inline void
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internal_sigfillset (internal_sigset_t *set)
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{
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int cnt = __NSIG_WORDS;
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while (--cnt >= 0)
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set->__val[cnt] = ~0UL;
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}
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static inline int
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internal_sigisemptyset (const internal_sigset_t *set)
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{
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int cnt = __NSIG_WORDS;
|
||||
int ret = set->__val[--cnt];
|
||||
while (ret == 0 && --cnt >= 0)
|
||||
ret = set->__val[cnt];
|
||||
return ret == 0;
|
||||
}
|
||||
|
||||
static inline void
|
||||
internal_sigandset (internal_sigset_t *dest, const internal_sigset_t *left,
|
||||
const internal_sigset_t *right)
|
||||
{
|
||||
int cnt = __NSIG_WORDS;
|
||||
while (--cnt >= 0)
|
||||
dest->__val[cnt] = left->__val[cnt] & right->__val[cnt];
|
||||
}
|
||||
|
||||
static inline void
|
||||
internal_sigorset (internal_sigset_t *dest, const internal_sigset_t *left,
|
||||
const internal_sigset_t *right)
|
||||
{
|
||||
int cnt = __NSIG_WORDS;
|
||||
while (--cnt >= 0)
|
||||
dest->__val[cnt] = left->__val[cnt] | right->__val[cnt];
|
||||
}
|
||||
|
||||
static inline int
|
||||
internal_sigismember (const internal_sigset_t *set, int sig)
|
||||
{
|
||||
unsigned long int mask = __sigmask (sig);
|
||||
unsigned long int word = __sigword (sig);
|
||||
return set->__val[word] & mask ? 1 : 0;
|
||||
}
|
||||
|
||||
static inline void
|
||||
internal_sigaddset (internal_sigset_t *set, int sig)
|
||||
{
|
||||
unsigned long int mask = __sigmask (sig);
|
||||
unsigned long int word = __sigword (sig);
|
||||
set->__val[word] |= mask;
|
||||
}
|
||||
|
||||
static inline void
|
||||
internal_sigdelset (internal_sigset_t *set, int sig)
|
||||
{
|
||||
unsigned long int mask = __sigmask (sig);
|
||||
unsigned long int word = __sigword (sig);
|
||||
set->__val[word] &= ~mask;
|
||||
}
|
||||
|
||||
#endif /* _INTERNAL_SIGSET_H */
|
@ -57,7 +57,7 @@
|
||||
|
||||
struct posix_spawn_args
|
||||
{
|
||||
sigset_t oldmask;
|
||||
internal_sigset_t oldmask;
|
||||
const char *file;
|
||||
int (*exec) (const char *, char *const *, char *const *);
|
||||
const posix_spawn_file_actions_t *fa;
|
||||
@ -124,7 +124,7 @@ __spawni_child (void *arguments)
|
||||
}
|
||||
else if (__sigismember (&hset, sig))
|
||||
{
|
||||
if (__is_internal_signal (sig))
|
||||
if (is_internal_signal (sig))
|
||||
sa.sa_handler = SIG_IGN;
|
||||
else
|
||||
{
|
||||
@ -284,8 +284,10 @@ __spawni_child (void *arguments)
|
||||
|
||||
/* Set the initial signal mask of the child if POSIX_SPAWN_SETSIGMASK
|
||||
is set, otherwise restore the previous one. */
|
||||
__sigprocmask (SIG_SETMASK, (attr->__flags & POSIX_SPAWN_SETSIGMASK)
|
||||
? &attr->__ss : &args->oldmask, 0);
|
||||
if (attr->__flags & POSIX_SPAWN_SETSIGMASK)
|
||||
__sigprocmask (SIG_SETMASK, &attr->__ss, NULL);
|
||||
else
|
||||
internal_sigprocmask (SIG_SETMASK, &args->oldmask, NULL);
|
||||
|
||||
args->exec (args->file, args->argv, args->envp);
|
||||
|
||||
@ -368,7 +370,7 @@ __spawnix (pid_t * pid, const char *file,
|
||||
args.envp = envp;
|
||||
args.xflags = xflags;
|
||||
|
||||
__libc_signal_block_all (&args.oldmask);
|
||||
internal_signal_block_all (&args.oldmask);
|
||||
|
||||
/* The clone flags used will create a new child that will run in the same
|
||||
memory space (CLONE_VM) and the execution of calling thread will be
|
||||
@ -416,7 +418,7 @@ __spawnix (pid_t * pid, const char *file,
|
||||
if ((ec == 0) && (pid != NULL))
|
||||
*pid = new_pid;
|
||||
|
||||
__libc_signal_restore_set (&args.oldmask);
|
||||
internal_signal_restore_set (&args.oldmask);
|
||||
|
||||
__pthread_setcancelstate (state, NULL);
|
||||
|
||||
|
@ -41,7 +41,7 @@ struct thread_start_data
|
||||
static void *
|
||||
timer_sigev_thread (void *arg)
|
||||
{
|
||||
__libc_signal_unblock_sigtimer (NULL);
|
||||
signal_unblock_sigtimer ();
|
||||
|
||||
struct thread_start_data *td = (struct thread_start_data *) arg;
|
||||
void (*thrfunc) (sigval_t) = td->thrfunc;
|
||||
|
Loading…
Reference in New Issue
Block a user