src/test/thread/thread_test.c

   1 /*-------------------------------------------------------------------------
   2  *
   3  * test_thread_funcs.c
   4  *              libc thread test program
   5  *
   6  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
   7  * Portions Copyright (c) 1994, Regents of the University of California
   8  *
   9  *      $PostgreSQL$
  10  *
  11  *      This program tests to see if your standard libc functions use
  12  *      pthread_setspecific()/pthread_getspecific() to be thread-safe.
  13  *      See src/port/thread.c for more details.
  14  *
  15  *      This program first tests to see if each function returns a constant
  16  *      memory pointer within the same thread, then, assuming it does, tests
  17  *      to see if the pointers are different for different threads.  If they
  18  *      are, the function is thread-safe.
  19  *
  20  *-------------------------------------------------------------------------
  21  */
  22
  23 #if !defined(IN_CONFIGURE) && !defined(WIN32)
  24 #include "postgres.h"
  25 #else
  26 /* From src/include/c.h" */
  27 #ifndef bool
  28 typedef char bool;
  29 #endif
  30
  31 #ifndef true
  32 #define true    ((bool) 1)
  33 #endif
  34
  35 #ifndef false
  36 #define false   ((bool) 0)
  37 #endif
  38 #endif
  39
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <unistd.h>
  43 #include <netdb.h>
  44 #include <sys/types.h>
  45 #include <pwd.h>
  46 #include <string.h>
  47 #include <fcntl.h>
  48 #include <errno.h>
  49
  50 /* CYGWIN requires this for MAXHOSTNAMELEN */
  51 #ifdef __CYGWIN__
  52 #include <sys/param.h>
  53 #endif
  54
  55 /******************************************************************
  56  * Windows Hacks
  57  *****************************************************************/
  58
  59 #ifdef WIN32
  60 #define MAXHOSTNAMELEN 63
  61 #include <winsock2.h>
  62
  63 int                     mkstemp(char *template);
  64
  65 int
  66 mkstemp(char *template)
  67 {
  68         FILE       *foo;
  69
  70         mktemp(template);
  71         foo = fopen(template, "rw");
  72         if (!foo)
  73                 return -1;
  74         else
  75                 return (int) foo;
  76 }
  77 #endif
  78
  79 /******************************************************************
  80  * End Windows Hacks
  81  *****************************************************************/
  82
  83
  84 /* Test for POSIX.1c 2-arg sigwait() and fail on single-arg version */
  85 #include <signal.h>
  86 int                     sigwait(const sigset_t *set, int *sig);
  87
  88
  89 #if !defined(ENABLE_THREAD_SAFETY) && !defined(IN_CONFIGURE) && !(defined(WIN32))
  90 int
  91 main(int argc, char *argv[])
  92 {
  93         fprintf(stderr, "This PostgreSQL build does not support threads.\n");
  94         fprintf(stderr, "Perhaps rerun 'configure' using '--enable-thread-safety'.\n");
  95         return 1;
  96 }
  97 #else
  98
  99 /* This must be down here because this is the code that uses threads. */
 100 #include <pthread.h>
 101
 102 static void func_call_1(void);
 103 static void func_call_2(void);
 104
 105 #ifdef WIN32
 106 #define         TEMP_FILENAME_1 "thread_test.1.XXXXXX"
 107 #define         TEMP_FILENAME_2 "thread_test.2.XXXXXX"
 108 #else
 109 #define         TEMP_FILENAME_1 "/tmp/thread_test.1.XXXXXX"
 110 #define         TEMP_FILENAME_2 "/tmp/thread_test.2.XXXXXX"
 111 #endif
 112
 113 static char *temp_filename_1;
 114 static char *temp_filename_2;
 115
 116 static pthread_mutex_t init_mutex = PTHREAD_MUTEX_INITIALIZER;
 117
 118 static volatile int thread1_done = 0;
 119 static volatile int thread2_done = 0;
 120
 121 static volatile int errno1_set = 0;
 122 static volatile int errno2_set = 0;
 123
 124 #ifndef HAVE_STRERROR_R
 125 static char *strerror_p1;
 126 static char *strerror_p2;
 127 static bool strerror_threadsafe = false;
 128 #endif
 129
 130 #ifndef WIN32
 131 #ifndef HAVE_GETPWUID_R
 132 static struct passwd *passwd_p1;
 133 static struct passwd *passwd_p2;
 134 static bool getpwuid_threadsafe = false;
 135 #endif
 136 #endif
 137
 138 #if !defined(HAVE_GETADDRINFO) && !defined(HAVE_GETHOSTBYNAME_R)
 139 static struct hostent *hostent_p1;
 140 static struct hostent *hostent_p2;
 141 static char myhostname[MAXHOSTNAMELEN];
 142 static bool gethostbyname_threadsafe = false;
 143 #endif
 144
 145 static bool platform_is_threadsafe = true;
 146
 147 int
 148 main(int argc, char *argv[])
 149 {
 150         pthread_t       thread1,
 151                                 thread2;
 152         int                     fd;
 153
 154 #ifdef WIN32
 155         WSADATA         wsaData;
 156         int                     err;
 157 #endif
 158
 159         if (argc > 1)
 160         {
 161                 fprintf(stderr, "Usage: %s\n", argv[0]);
 162                 return 1;
 163         }
 164
 165 #ifdef IN_CONFIGURE
 166         /* Send stdout to 'config.log' */
 167         close(1);
 168         dup(5);
 169 #endif
 170
 171 #ifdef WIN32
 172         err = WSAStartup(MAKEWORD(1, 1), &wsaData);
 173         if (err != 0)
 174         {
 175                 fprintf(stderr, "Cannot start the network subsystem - %d**\nexiting\n", err);
 176                 exit(1);
 177         }
 178 #endif
 179
 180         /* Make temp filenames, might not have strdup() */
 181         temp_filename_1 = malloc(strlen(TEMP_FILENAME_1) + 1);
 182         strcpy(temp_filename_1, TEMP_FILENAME_1);
 183         fd = mkstemp(temp_filename_1);
 184         close(fd);
 185
 186         temp_filename_2 = malloc(strlen(TEMP_FILENAME_2) + 1);
 187         strcpy(temp_filename_2, TEMP_FILENAME_2);
 188         fd = mkstemp(temp_filename_2);
 189         close(fd);
 190
 191 #if !defined(HAVE_GETADDRINFO) && !defined(HAVE_GETHOSTBYNAME_R)
 192         if (gethostname(myhostname, MAXHOSTNAMELEN) != 0)
 193         {
 194                 fprintf(stderr, "Cannot get local hostname **\nexiting\n");
 195                 exit(1);
 196         }
 197 #endif
 198
 199         /* Hold lock until we are ready for the child threads to exit. */
 200         pthread_mutex_lock(&init_mutex);
 201
 202         pthread_create(&thread1, NULL, (void *(*) (void *)) func_call_1, NULL);
 203         pthread_create(&thread2, NULL, (void *(*) (void *)) func_call_2, NULL);
 204
 205         while (thread1_done == 0 || thread2_done == 0)
 206                 sched_yield();                  /* if this is a portability problem, remove it */
 207 #ifdef WIN32
 208         printf("Your GetLastError() is thread-safe.\n");
 209 #else
 210         printf("Your errno is thread-safe.\n");
 211 #endif
 212
 213 #ifndef HAVE_STRERROR_R
 214         if (strerror_p1 != strerror_p2)
 215                 strerror_threadsafe = true;
 216 #endif
 217
 218 #ifndef WIN32
 219 #ifndef HAVE_GETPWUID_R
 220         if (passwd_p1 != passwd_p2)
 221                 getpwuid_threadsafe = true;
 222 #endif
 223 #endif
 224
 225 #if !defined(HAVE_GETADDRINFO) && !defined(HAVE_GETHOSTBYNAME_R)
 226         if (hostent_p1 != hostent_p2)
 227                 gethostbyname_threadsafe = true;
 228 #endif
 229
 230         pthread_mutex_unlock(&init_mutex);      /* let children exit  */
 231
 232         pthread_join(thread1, NULL);    /* clean up children */
 233         pthread_join(thread2, NULL);
 234
 235 #ifdef HAVE_STRERROR_R
 236         printf("Your system has sterror_r();  it does not need strerror().\n");
 237 #else
 238         printf("Your system uses strerror() which is ");
 239         if (strerror_threadsafe)
 240                 printf("thread-safe.\n");
 241         else
 242         {
 243                 printf("not thread-safe. **\n");
 244                 platform_is_threadsafe = false;
 245         }
 246 #endif
 247
 248 #ifndef WIN32
 249 #ifdef HAVE_GETPWUID_R
 250         printf("Your system has getpwuid_r();  it does not need getpwuid().\n");
 251 #else
 252         printf("Your system uses getpwuid() which is ");
 253         if (getpwuid_threadsafe)
 254                 printf("thread-safe.\n");
 255         else
 256         {
 257                 printf("not thread-safe. **\n");
 258                 platform_is_threadsafe = false;
 259         }
 260 #endif
 261 #else
 262         printf("getpwuid_r()/getpwuid() are not applicable to Win32 platforms.\n");
 263 #endif
 264
 265 #ifdef HAVE_GETADDRINFO
 266         printf("Your system has getaddrinfo();  it does not need gethostbyname()\n"
 267                    "  or gethostbyname_r().\n");
 268 #else
 269 #ifdef HAVE_GETHOSTBYNAME_R
 270         printf("Your system has gethostbyname_r();  it does not need gethostbyname().\n");
 271 #else
 272         printf("Your system uses gethostbyname which is ");
 273         if (gethostbyname_threadsafe)
 274                 printf("thread-safe.\n");
 275         else
 276         {
 277                 printf("not thread-safe. **\n");
 278                 platform_is_threadsafe = false;
 279         }
 280 #endif
 281 #endif
 282
 283         if (platform_is_threadsafe)
 284         {
 285                 printf("\nYour platform is thread-safe.\n");
 286                 return 0;
 287         }
 288         else
 289         {
 290                 printf("\n** YOUR PLATFORM IS NOT THREAD-SAFE. **\n");
 291                 return 1;
 292         }
 293 }
 294
 295 static void
 296 func_call_1(void)
 297 {
 298 #if !defined(HAVE_GETPWUID_R) || \
 299         (!defined(HAVE_GETADDRINFO) && \
 300          !defined(HAVE_GETHOSTBYNAME_R))
 301         void       *p;
 302 #endif
 303 #ifdef WIN32
 304         HANDLE          h1;
 305         HANDLE          h2;
 306 #endif
 307         unlink(temp_filename_1);
 308
 309
 310         /* create, then try to fail on exclusive create open */
 311 #ifdef WIN32
 312         h1 = CreateFile(temp_filename_1, GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, 0, NULL);
 313         h2 = CreateFile(temp_filename_1, GENERIC_WRITE, 0, NULL, CREATE_NEW, 0, NULL);
 314         if (h1 == INVALID_HANDLE_VALUE || GetLastError() != ERROR_FILE_EXISTS)
 315 #else
 316         if (open(temp_filename_1, O_RDWR | O_CREAT, 0600) < 0 ||
 317                 open(temp_filename_1, O_RDWR | O_CREAT | O_EXCL, 0600) >= 0)
 318 #endif
 319         {
 320 #ifdef WIN32
 321                 fprintf(stderr, "Could not create file in current directory or\n");
 322                 fprintf(stderr, "Could not generate failure for create file in current directory **\nexiting\n");
 323 #else
 324                 fprintf(stderr, "Could not create file in /tmp or\n");
 325                 fprintf(stderr, "Could not generate failure for create file in /tmp **\nexiting\n");
 326 #endif
 327                 exit(1);
 328         }
 329
 330         /*
 331          * Wait for other thread to set errno. We can't use thread-specific
 332          * locking here because it might affect errno.
 333          */
 334         errno1_set = 1;
 335         while (errno2_set == 0)
 336                 sched_yield();
 337 #ifdef WIN32
 338         if (GetLastError() != ERROR_FILE_EXISTS)
 339 #else
 340         if (errno != EEXIST)
 341 #endif
 342         {
 343 #ifdef WIN32
 344                 fprintf(stderr, "GetLastError() not thread-safe **\nexiting\n");
 345 #else
 346                 fprintf(stderr, "errno not thread-safe **\nexiting\n");
 347 #endif
 348                 unlink(temp_filename_1);
 349                 exit(1);
 350         }
 351         unlink(temp_filename_1);
 352
 353 #ifndef HAVE_STRERROR_R
 354         strerror_p1 = strerror(EACCES);
 355
 356         /*
 357          * If strerror() uses sys_errlist, the pointer might change for different
 358          * errno values, so we don't check to see if it varies within the thread.
 359          */
 360 #endif
 361
 362 #ifndef WIN32
 363 #ifndef HAVE_GETPWUID_R
 364         passwd_p1 = getpwuid(0);
 365         p = getpwuid(1);
 366         if (passwd_p1 != p)
 367         {
 368                 printf("Your getpwuid() changes the static memory area between calls\n");
 369                 passwd_p1 = NULL;               /* force thread-safe failure report */
 370         }
 371 #endif
 372 #endif
 373
 374 #if !defined(HAVE_GETADDRINFO) && !defined(HAVE_GETHOSTBYNAME_R)
 375         /* threads do this in opposite order */
 376         hostent_p1 = gethostbyname(myhostname);
 377         p = gethostbyname("localhost");
 378         if (hostent_p1 != p)
 379         {
 380                 printf("Your gethostbyname() changes the static memory area between calls\n");
 381                 hostent_p1 = NULL;              /* force thread-safe failure report */
 382         }
 383 #endif
 384
 385         thread1_done = 1;
 386         pthread_mutex_lock(&init_mutex);        /* wait for parent to test */
 387         pthread_mutex_unlock(&init_mutex);
 388 }
 389
 390
 391 static void
 392 func_call_2(void)
 393 {
 394 #if !defined(HAVE_GETPWUID_R) || \
 395         (!defined(HAVE_GETADDRINFO) && \
 396          !defined(HAVE_GETHOSTBYNAME_R))
 397         void       *p;
 398 #endif
 399
 400         unlink(temp_filename_2);
 401         /* open non-existant file */
 402 #ifdef WIN32
 403         CreateFile(temp_filename_2, GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
 404         if (GetLastError() != ERROR_FILE_NOT_FOUND)
 405 #else
 406         if (open(temp_filename_2, O_RDONLY, 0600) >= 0)
 407 #endif
 408         {
 409                 fprintf(stderr, "Read-only open succeeded without create **\nexiting\n");
 410                 exit(1);
 411         }
 412
 413         /*
 414          * Wait for other thread to set errno. We can't use thread-specific
 415          * locking here because it might affect errno.
 416          */
 417         errno2_set = 1;
 418         while (errno1_set == 0)
 419                 sched_yield();
 420 #ifdef WIN32
 421         if (GetLastError() != ENOENT)
 422 #else
 423         if (errno != ENOENT)
 424 #endif
 425         {
 426 #ifdef WIN32
 427                 fprintf(stderr, "GetLastError() not thread-safe **\nexiting\n");
 428 #else
 429                 fprintf(stderr, "errno not thread-safe **\nexiting\n");
 430 #endif
 431                 unlink(temp_filename_2);
 432                 exit(1);
 433         }
 434         unlink(temp_filename_2);
 435
 436 #ifndef HAVE_STRERROR_R
 437         strerror_p2 = strerror(EINVAL);
 438
 439         /*
 440          * If strerror() uses sys_errlist, the pointer might change for different
 441          * errno values, so we don't check to see if it varies within the thread.
 442          */
 443 #endif
 444
 445 #ifndef WIN32
 446 #ifndef HAVE_GETPWUID_R
 447         passwd_p2 = getpwuid(2);
 448         p = getpwuid(3);
 449         if (passwd_p2 != p)
 450         {
 451                 printf("Your getpwuid() changes the static memory area between calls\n");
 452                 passwd_p2 = NULL;               /* force thread-safe failure report */
 453         }
 454 #endif
 455 #endif
 456
 457 #if !defined(HAVE_GETADDRINFO) && !defined(HAVE_GETHOSTBYNAME_R)
 458         /* threads do this in opposite order */
 459         hostent_p2 = gethostbyname("localhost");
 460         p = gethostbyname(myhostname);
 461         if (hostent_p2 != p)
 462         {
 463                 printf("Your gethostbyname() changes the static memory area between calls\n");
 464                 hostent_p2 = NULL;              /* force thread-safe failure report */
 465         }
 466 #endif
 467
 468         thread2_done = 1;
 469         pthread_mutex_lock(&init_mutex);        /* wait for parent to test */
 470         pthread_mutex_unlock(&init_mutex);
 471 }
 472
 473 #endif   /* !ENABLE_THREAD_SAFETY && !IN_CONFIGURE */