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/* This testcase is part of GDB, the GNU debugger.
Copyright 2015-2021 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <pthread.h>
#include <unistd.h>
#include "trace-common.h"
/* Called if the testcase failed. */
static void
fail (void)
{
}
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
/* This function overrides gdb_collect in the in-process agent library.
See gdbserver/tracepoint.c (gdb_collect). We want this function to
be ran instead of the one from the library to easily check that only
one thread is tracing at a time.
This works as expected because GDBserver will ask GDB about symbols
present in the inferior with the 'qSymbol' packet. And GDB will
reply with the address of this function instead of the one from the
in-process agent library. */
void
gdb_agent_gdb_collect (void *tpoint, unsigned char *regs)
{
/* If we cannot acquire a lock, then this means another thread is
tracing and the lock implemented by the jump pad is not working! */
if (pthread_mutex_trylock (&mutex) != 0)
{
fail ();
return;
}
sleep (1);
if (pthread_mutex_unlock (&mutex) != 0)
{
fail ();
return;
}
}
static void *
thread_function (void *arg)
{
FAST_TRACEPOINT_LABEL(set_point);
}
static void
end (void)
{
}
int
main (int argc, char *argv[], char *envp[])
{
pthread_t threads[NUM_THREADS];
int i;
for (i = 0; i < NUM_THREADS; i++)
pthread_create (&threads[i], NULL, thread_function, NULL);
for (i = 0; i < NUM_THREADS; i++)
pthread_join (threads[i], NULL);
end ();
return 0;
}
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