Gecko [ dataharbor.africa ]

Name	Size	Permission
addr-map.c	525 B	-rw-r--r--
alloc.c	1.16 KB	-rw-r--r--
arith.c	2.24 KB	-rw-r--r--
common_session_state.h	6.76 KB	-rw-r--r--
copy.c	4 KB	-rw-r--r--
debug.h	413 B	-rw-r--r--
ilog2.h	2.87 KB	-rw-r--r--
io.c	4.43 KB	-rw-r--r--
linux_defs.h	5.58 KB	-rw-r--r--
linux_hash.h	1.83 KB	-rw-r--r--
linux_types.h	654 B	-rw-r--r--
loc2c-runtime.h	2.44 KB	-rw-r--r--
map_list.h	1.03 KB	-rw-r--r--
map_runtime.h	5.04 KB	-rw-r--r--
namespaces.h	0 B	-rw-r--r--
offptr.h	4.68 KB	-rw-r--r--
offset_list.h	4.32 KB	-rw-r--r--
perf.c	0 B	-rw-r--r--
print.c	2.37 KB	-rw-r--r--
probe_lock.h	1.81 KB	-rw-r--r--
regs.c	2.14 KB	-rw-r--r--
runtime.h	9.49 KB	-rw-r--r--
runtime_context.h	6.4 KB	-rw-r--r--
runtime_defines.h	235 B	-rw-r--r--
session_attributes.c	1.68 KB	-rw-r--r--
session_attributes.h	772 B	-rw-r--r--
shm.c	6.03 KB	-rw-r--r--
stapdyn.h	3.37 KB	-rw-r--r--
stat_runtime.h	1.79 KB	-rw-r--r--
sym.c	40 B	-rw-r--r--
task_finder.c	0 B	-rw-r--r--
timer.c	2.71 KB	-rw-r--r--
transport.c	30.4 KB	-rw-r--r--
transport.h	3.88 KB	-rw-r--r--
unwind.c	0 B	-rw-r--r--
uprobes-regs.c	1.94 KB	-rw-r--r--
uprobes.c	1.76 KB	-rw-r--r--
uprobes.h	953 B	-rw-r--r--

Code Editor : probe_lock.h

/* dyninst probe locking header file
 * Copyright (C) 2012, 2017 Red Hat Inc.
 *
 * This file is part of systemtap, and is free software.  You can
 * redistribute it and/or modify it under the terms of the GNU General
 * Public License (GPL); either version 2, or (at your option) any
 * later version.
 */

#ifndef _STAPDYN_PROBE_LOCK_H
#define _STAPDYN_PROBE_LOCK_H

#include <pthread.h>

struct stp_probe_lock {
	#ifdef STP_TIMING
	atomic_t *skipped;
	atomic_t *contention;
	#endif
	pthread_rwlock_t *lock;
	unsigned write_p;
};

static void
stp_unlock_probe(const struct stp_probe_lock *locks, unsigned num_locks)
{
	unsigned i;
	for (i = num_locks; i-- > 0;) {
		pthread_rwlock_unlock(locks[i].lock);
	}
}

static unsigned
stp_lock_probe(const struct stp_probe_lock *locks, unsigned num_locks)
{
#if 0 // XXX: should we bother with trylocks in pure userspace?
	unsigned i, retries = 0;
	for (i = 0; i < num_locks; ++i) {
		if (locks[i].write_p)
			while (!pthread_rwlock_trywrlock(locks[i].lock)) {
#if !define(STAP_SUPRESS_TIME_LIMITS_ENABLE)
				if (++retries > MAXTRYLOCK)
					goto skip;
#endif
				#ifdef STP_TIMING
					atomic_inc(locks[i].contention);
				#endif
				udelay (TRYLOCKDELAY);
			}
		else
			while (!pthread_rwlock_tryrdlock(locks[i].lock)) {
#if !define(STAP_SUPPRESS_TIME_LIMITS_ENABLE)
				if (++retries > MAXTRYLOCK)
					goto skip;
#endif
				#ifdef STP_TIMING
					atomic_inc(locks[i].contention);
				#endif
				udelay (TRYLOCKDELAY);
			}
	}
	return 1;

skip:
	atomic_inc(skipped_count());
#ifdef STP_TIMING
	atomic_inc(locks[i].skipped);
#endif
	stp_unlock_probe(locks, i);
	return 0;
#else
	unsigned i;
	for (i = 0; i < num_locks; ++i) {
		if (locks[i].write_p)
			pthread_rwlock_wrlock(locks[i].lock);
		else
			pthread_rwlock_rdlock(locks[i].lock);
	}
	return 1;
#endif
}

#endif /* _STAPDYN_PROBE_LOCK_H */

${this.title}

Code Editor : probe_lock.h