Attachment 28607 Details for Bug 66013

pthread_rwlock_rdlock/2-1.c

2-1.c (text/plain), 7.59 KB, created by Gernot Payer on 2005-02-18 00:03:26 UTC

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Creator: Gernot Payer

Created: 2005-02-18 00:03:26 UTC

Size: 7.59 KB

patch

obsolete

>/*   
> * Copyright (c) 2002, Intel Corporation. All rights reserved.
> * This file is licensed under the GPL license.  For the full content
> * of this license, see the COPYING file at the top level of this 
> * source tree.
>
> * Test that pthread_rwlock_rdlock(pthread_rwlock_t *rwlock)
> *
> * 	If the Thread Execution Scheduling option is supported, 
> *	and the threads involved in the lock are executing with the 
> *	scheduling policies SCHED_FIFO or SCHED_RR, the calling thread shall not
> *	acquire the lock if a writer holds the lock or if writers of 
> *	higher or equal priority are blocked on the lock; 
> *	otherwise, the calling thread shall acquire the lock.
> *
> * In this case, we test "higher priority writer block"
> *
> Steps:
> * We have three threads, main(also a reader), writer, reader
> *
> * 1.  Main thread set its shcedule policy as "SCHED_FIFO", with highest priority 
> *     the three: sched_get_priority_min()+2.
> * 2.  Main thread read lock 'rwlock'
> * 3.  Create a writer thread, with schedule policy as "SCHED_FIFO", and priority
> * 	using sched_get_priority_min()+1.
> * 4.  The thread write lock 'rwlock', should block.
> * 5.  Main thread create a reader thread, with schedule policy as "SCHED_FIFO", and
> *     priority sched_get_priority_min()
> * 6.  Reader thread read lock 'rwlock', should block, since there is a higher priority
> *     writer blocked on 'rwlock'
> * 7.  Main thread release the 'rwlock', the writer should get the lock first
> */
>
>/* NOTE: The test result is UNSUPPORTED if Thread Execution Scheduling option
> * 	 is not supported.
> */
>
>#define _XOPEN_SOURCE 600
>#include <pthread.h>
>#include <stdio.h>
>#include <stdlib.h>
>#include <unistd.h>
>#include <string.h>
>#include <sched.h>
>#include "posixtest.h"
>
>#define TRD_POLICY SCHED_FIFO
>
>static pthread_rwlock_t rwlock;
>static int rd_thread_state;
>static int wr_thread_state; 
>
>/* thread states: 
>	1: not in child thread yet; 
>	2: just enter child thread ;
>	3: just before child thread exit;
>*/
>
>#define NOT_CREATED_THREAD 1
>#define ENTERED_THREAD 2
>#define EXITING_THREAD 3
>
>static int set_priority(pthread_t pid, unsigned policy, unsigned prio)
>{
>        struct sched_param sched_param;
>        memset(&sched_param, 0, sizeof(sched_param));
>        sched_param.sched_priority = prio;
>        if (pthread_setschedparam(pid, policy, &sched_param) == -1)
>        {
>                printf("Can't set policy to %d and prio to %d\n",
>                        policy, prio);
>                exit(PTS_UNRESOLVED);
>        }
>        return 0;
>}
>
>static void* fn_rd(void *arg)
>{ 
>	int rc = 0;
>	int priority;
>	rd_thread_state = ENTERED_THREAD;
>	
>	priority = (long)arg;
>	set_priority(pthread_self(), TRD_POLICY, priority);
>
>	printf("rd_thread: attempt read lock\n");
>	rc = pthread_rwlock_rdlock(&rwlock);
>	if(rc != 0)
>	{
>		printf("Test FAILED: rd_thread failed to get read lock, Error code:%d\n"
>			, rc);
>		exit(PTS_FAIL);
>	} else 
>		printf("rd_thread: acquired read lock\n");		
>	
>
>	sleep(1);
>
>	printf("rd_thread: unlock read lock\n");
>	if(pthread_rwlock_unlock(&rwlock) != 0)
>	{
>		printf("rd_thread: Error at pthread_rwlock_unlock()\n");
>		exit(PTS_UNRESOLVED);
>	}
>	rd_thread_state = EXITING_THREAD;
>	pthread_exit(0);
>	return NULL;
>}
> 
>static void* fn_wr(void *arg)
>{ 
>	int rc = 0;
>	int priority;
>	wr_thread_state = ENTERED_THREAD;
>	
>	priority = (long)arg;
>	set_priority(pthread_self(), TRD_POLICY, priority);
>
>	printf("wr_thread: attempt write lock\n");
>	rc = pthread_rwlock_wrlock(&rwlock);
>	if(rc != 0)
>	{
>		printf("Error: wr_thread failed to get write lock, Error code:%d\n"
>			, rc);
>		exit(PTS_UNRESOLVED);
>	} else
>		printf("wr_thread: acquired write lock\n");
>
>	sleep(1);
>
>	printf("wr_thread: unlock write lock\n");
>	if(pthread_rwlock_unlock(&rwlock) != 0)
>	{
>		printf("wr_thread: Error at pthread_rwlock_unlock()\n");
>		exit(PTS_UNRESOLVED);
>	}
>	wr_thread_state = EXITING_THREAD;
>	pthread_exit(0);
>	return NULL;
>}
> 
>int main()
>{
>	#ifndef _POSIX_THREAD_PRIORITY_SCHEDULING
>  		printf("Posix Thread Execution Scheduling not supported\n");
>  		return PTS_UNSUPPORTED;
>	#endif
>
>	int cnt = 0;
>	pthread_t rd_thread, wr_thread;
>	int priority;
>	
>	/* main thread needs to have the highest priority*/
>	priority = sched_get_priority_min(TRD_POLICY) + 2;
>	set_priority(pthread_self(), TRD_POLICY, priority);
>	printf("main: has priority: %d\n", priority);
>
>	if(pthread_rwlock_init(&rwlock, NULL) != 0)
>	{
>		printf("main: Error at pthread_rwlock_init()\n");
>		return PTS_UNRESOLVED;
>	}
>
>	printf("main: attempt read lock\n");
>	/* This read lock should succeed */	
>	if(pthread_rwlock_rdlock(&rwlock) != 0)
>	{
>		printf("Test FAILED: main cannot get read lock when no one owns the lock\n");
>		return PTS_FAIL;
>	} else
>		printf("main: acquired read lock\n");
>	
>	wr_thread_state = NOT_CREATED_THREAD;
>	priority = sched_get_priority_min(TRD_POLICY) + 1;
>	printf("main: create wr_thread, with priority: %d\n", priority);
>	if(pthread_create(&wr_thread, NULL, fn_wr, (void*)(long)priority) != 0)
>	{
>		printf("main: Error at 1st pthread_create()\n");
>		return PTS_UNRESOLVED;
>	}
>	
>	/* If the shared data is not altered by child after 3 seconds,
>	   we regard it as blocked */
>	
>	/* We expect the wr_thread to block */
>	cnt = 0;
>	do{
>		sleep(1);
>	}while (wr_thread_state !=EXITING_THREAD && cnt++ < 3); 
>	
>	if(wr_thread_state == EXITING_THREAD)
>	{
>		printf("wr_thread did not block on write lock, when a reader owns the lock\n");
>		exit(PTS_UNRESOLVED);
>	}
>	else if(wr_thread_state != ENTERED_THREAD)
>	{
>		printf("Unexpected wr_thread state: %d\n", wr_thread_state);
>		exit(PTS_UNRESOLVED);
>	}
>	
>	rd_thread_state = 1;
>	priority = sched_get_priority_min(TRD_POLICY);
>	printf("main: create rd_thread, with priority: %d\n", priority);
>	if(pthread_create(&rd_thread, NULL, fn_rd, (void*)(long)priority) != 0)
>	{
>		printf("main: failed at creating rd_thread\n");
>		return PTS_UNRESOLVED;
>	}
>	
>	/* We expect the rd_thread to block*/
>	cnt = 0;
>	do{
>		sleep(1);
>	}while (rd_thread_state !=EXITING_THREAD && cnt++ < 3); 
>	
>	if(rd_thread_state == EXITING_THREAD)
>	{
>		printf("Test FAILED: rd_thread did not block on read lock, when a reader owns the lock, and a higher priority writer is waiting for the lock\n");
>		exit(PTS_FAIL);
>	}
>	else if(rd_thread_state != ENTERED_THREAD)
>	{
>		printf("Unexpected rd_thread state: %d\n", rd_thread_state);
>		exit(PTS_UNRESOLVED);
>	}
>
>	printf("main: unlock read lock\n");
>	if(pthread_rwlock_unlock(&rwlock) != 0)
>	{
>		printf("main: failed to unlock read lock\n");
>		exit(PTS_UNRESOLVED);
>	}
>	
>	/* we expect the writer get the lock */
>	cnt = 0;
>	do{
>		sleep(1);
>	}while (wr_thread_state !=EXITING_THREAD && cnt++ < 3); 
>	
>	if(wr_thread_state == ENTERED_THREAD)
>	{
>		printf("Test FAILED: higher priority wr_thread still blocked on write lock, when a reader release the lock\n");
>		exit(PTS_FAIL);
>	}
>	else if(wr_thread_state != EXITING_THREAD)
>	{
>		printf("Unexpected wr_thread state: %d\n", wr_thread_state);
>		exit(PTS_UNRESOLVED);
>	}
>
>	if(pthread_join(wr_thread, NULL) != 0)
>	{
>		printf("main: Error at 1st pthread_join()\n");
>		exit(PTS_UNRESOLVED);
>	}
>	/* we expect the reader get the lock when writer has unlocked the lock*/
>	cnt = 0;
>	do{
>		sleep(1);
>	}while (rd_thread_state !=EXITING_THREAD && cnt++ < 3); 
>	
>	if(rd_thread_state == ENTERED_THREAD )
>	{
>		printf("Test FAILED: rd_thread still block on read lock when the lock has no owner\n");
>		exit(PTS_FAIL);
>	}
>	else if(rd_thread_state != EXITING_THREAD)
>	{
>		printf("Unexpected rd_thread state\n");
>		exit(PTS_UNRESOLVED);
>	}
>	
>	if(pthread_join(rd_thread, NULL) != 0)
>	{
>		printf("main: Error at 2nd pthread_join()\n");
>		exit(PTS_UNRESOLVED);
>	}
>
>	if(pthread_rwlock_destroy(&rwlock) != 0)
>	{
>		printf("Error at pthread_rwlockattr_destroy()");
>		return PTS_UNRESOLVED;
>	}	
>
>	printf("Test PASSED\n");
>	return PTS_PASS;
>}

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Attachments on bug 66013: 28607