liblttng-ust/wait.h

   1 /*
   2  * SPDX-License-Identifier: LGPL-2.1-only
   3  *
   4  * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  */
   6
   7 #ifndef _UST_WAIT_H
   8 #define _UST_WAIT_H
   9
  10 #include <poll.h>
  11
  12 /*
  13  * Wait until "cond" gets true or timeout (in ms).
  14  */
  15 #define wait_cond_interruptible_timeout(_cond, _timeout)        \
  16         ({                                                      \
  17                 int __ret = 0, __pollret;                       \
  18                 int __timeout = _timeout;                       \
  19                                                                 \
  20                 for (;;) {                                      \
  21                         if (_cond)                              \
  22                                 break;                          \
  23                         if (__timeout <= 0) {                   \
  24                                 __ret = -ETIMEDOUT;             \
  25                                 break;                          \
  26                         }                                       \
  27                         __pollret = poll(NULL, 0, 10);  /* wait 10ms */ \
  28                         if (__pollret < 0) {                    \
  29                                 __ret = -errno;                 \
  30                                 break;                          \
  31                         }                                       \
  32                         __timeout -= 10;                        \
  33                 }                                               \
  34                 __ret;                                          \
  35         })
  36
  37
  38 #endif /* _UST_WAIT_H */