1ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/** Initialize several kinds of mutexes and lock each mutex twice.
2ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown *  Note: locking a regular mutex twice causes a deadlock.
3ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown */
4ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
5ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#define _GNU_SOURCE
6ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
7ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <stdio.h>
8ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <unistd.h>
9ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <pthread.h>
10ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "../../config.h"
11ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
12ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
13ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic void lock_twice(pthread_mutex_t* const p)
14ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{
15ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown  if (pthread_mutex_trylock(p) != 0)
16ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    fprintf(stderr, "first lock call failed !\n");
17ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown  if (pthread_mutex_trylock(p) != 0)
18ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    fprintf(stderr, "second lock call failed !\n");
19ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown  if (pthread_mutex_unlock(p) != 0)
20ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    fprintf(stderr, "first unlock call failed !\n");
21ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown  if (pthread_mutex_unlock(p) != 0)
22ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    fprintf(stderr, "second unlock call failed !\n");
23ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown}
24ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
25ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownint main(int argc, char** argv)
26ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{
27ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#if defined(HAVE_PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP)
28ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown  {
29ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    pthread_mutex_t m = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
30ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
31ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    fprintf(stderr, "Recursive mutex (statically initialized).\n");
32ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    lock_twice(&m);
33ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    pthread_mutex_destroy(&m);
34ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown  }
35ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif
36ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#if defined(HAVE_PTHREAD_MUTEX_RECURSIVE_NP)
37ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown  {
38ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    pthread_mutex_t m;
39ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    pthread_mutexattr_t attr;
40ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
41ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    fprintf(stderr, "\nRecursive mutex (initialized via mutex attributes).\n");
42ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    pthread_mutexattr_init(&attr);
43ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE_NP);
44ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    pthread_mutex_init(&m, &attr);
45ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    pthread_mutexattr_destroy(&attr);
46ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    lock_twice(&m);
47ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    pthread_mutex_destroy(&m);
48ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown  }
49ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif
50ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#if defined(HAVE_PTHREAD_MUTEX_ERRORCHECK_NP)
51ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown  {
52ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    pthread_mutex_t m;
53ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    pthread_mutexattr_t attr;
54ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
55ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    fprintf(stderr, "\nError checking mutex.\n");
56ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    pthread_mutexattr_init(&attr);
57ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK_NP);
58ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    pthread_mutex_init(&m, &attr);
59ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    pthread_mutexattr_destroy(&attr);
60ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    lock_twice(&m);
61ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    pthread_mutex_destroy(&m);
62ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown  }
63ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif
64ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
65ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown  {
66ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
67ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
68ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    fprintf(stderr, "\nNon-recursive mutex.\n");
69ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown    lock_twice(&m);
70ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown  }
71ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
72ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown  fprintf(stderr, "\nDone.\n");
73ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown
74ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown  return 0;
75ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown}
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