lib/tdb/test/run-mutex-trylock.c

   1 #include "../common/tdb_private.h"
   2 #include "../common/io.c"
   3 #include "../common/tdb.c"
   4 #include "../common/lock.c"
   5 #include "../common/freelist.c"
   6 #include "../common/traverse.c"
   7 #include "../common/transaction.c"
   8 #include "../common/error.c"
   9 #include "../common/open.c"
  10 #include "../common/check.c"
  11 #include "../common/hash.c"
  12 #include "../common/mutex.c"
  13 #include "tap-interface.h"
  14 #include <stdlib.h>
  15 #include <sys/types.h>
  16 #include <sys/wait.h>
  17 #include <stdarg.h>
  18
  19 static TDB_DATA key, data;
  20
  21 static void log_fn(struct tdb_context *tdb, enum tdb_debug_level level,
  22                    const char *fmt, ...)
  23 {
  24         va_list ap;
  25         va_start(ap, fmt);
  26         vfprintf(stderr, fmt, ap);
  27         va_end(ap);
  28 }
  29
  30 static int do_child(int tdb_flags, int to, int from)
  31 {
  32         struct tdb_context *tdb;
  33         unsigned int log_count;
  34         struct tdb_logging_context log_ctx = { log_fn, &log_count };
  35         int ret;
  36         char c = 0;
  37
  38         tdb = tdb_open_ex("mutex-trylock.tdb", 0, tdb_flags,
  39                           O_RDWR|O_CREAT, 0755, &log_ctx, NULL);
  40         ok(tdb, "tdb_open_ex should succeed");
  41
  42         ret = tdb_chainlock(tdb, key);
  43         ok(ret == 0, "tdb_chainlock should succeed");
  44
  45         write(to, &c, sizeof(c));
  46
  47         read(from, &c, sizeof(c));
  48
  49         ret = tdb_chainunlock(tdb, key);
  50         ok(ret == 0, "tdb_chainunlock should succeed");
  51
  52         write(to, &c, sizeof(c));
  53
  54         return 0;
  55 }
  56
  57 /* The code should barf on TDBs created with rwlocks. */
  58 int main(int argc, char *argv[])
  59 {
  60         struct tdb_context *tdb;
  61         unsigned int log_count;
  62         struct tdb_logging_context log_ctx = { log_fn, &log_count };
  63         int ret, status;
  64         pid_t child, wait_ret;
  65         int fromchild[2];
  66         int tochild[2];
  67         char c;
  68         int tdb_flags;
  69         bool runtime_support;
  70
  71         runtime_support = tdb_runtime_check_for_robust_mutexes();
  72
  73         if (!runtime_support) {
  74                 skip(1, "No robust mutex support");
  75                 return exit_status();
  76         }
  77
  78         key.dsize = strlen("hi");
  79         key.dptr = discard_const_p(uint8_t, "hi");
  80         data.dsize = strlen("world");
  81         data.dptr = discard_const_p(uint8_t, "world");
  82
  83         pipe(fromchild);
  84         pipe(tochild);
  85
  86         tdb_flags = TDB_INCOMPATIBLE_HASH|
  87                 TDB_MUTEX_LOCKING|
  88                 TDB_CLEAR_IF_FIRST;
  89
  90         child = fork();
  91         if (child == 0) {
  92                 close(fromchild[0]);
  93                 close(tochild[1]);
  94                 return do_child(tdb_flags, fromchild[1], tochild[0]);
  95         }
  96         close(fromchild[1]);
  97         close(tochild[0]);
  98
  99         read(fromchild[0], &c, sizeof(c));
 100
 101         tdb = tdb_open_ex("mutex-trylock.tdb", 0, tdb_flags,
 102                           O_RDWR|O_CREAT, 0755, &log_ctx, NULL);
 103         ok(tdb, "tdb_open_ex should succeed");
 104
 105         ret = tdb_chainlock_nonblock(tdb, key);
 106         ok(ret == -1, "tdb_chainlock_nonblock should not succeed");
 107
 108         write(tochild[1], &c, sizeof(c));
 109
 110         read(fromchild[0], &c, sizeof(c));
 111
 112         ret = tdb_chainlock_nonblock(tdb, key);
 113         ok(ret == 0, "tdb_chainlock_nonblock should succeed");
 114         ret = tdb_chainunlock(tdb, key);
 115         ok(ret == 0, "tdb_chainunlock should succeed");
 116
 117         wait_ret = wait(&status);
 118         ok(wait_ret == child, "child should have exited correctly");
 119
 120         diag("done");
 121         return exit_status();
 122 }