tests/common/debug-yield.h

   1 // SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   2 // SPDX-FileCopyrightText: 2009 Paul E. McKenney, IBM Corporation.
   3 //
   4 // SPDX-License-Identifier: LGPL-2.1-or-later
   5
   6 #ifndef URCU_TESTS_DEBUG_YIELD_H
   7 #define URCU_TESTS_DEBUG_YIELD_H
   8
   9 /*
  10  * Userspace RCU library tests - Debugging header
  11  *
  12  * IBM's contributions to this file may be relicensed under LGPLv2 or later.
  13  */
  14
  15 #include <sched.h>
  16 #include <time.h>
  17 #include <pthread.h>
  18 #include <unistd.h>
  19
  20 #include <compat-rand.h>
  21
  22 #define RCU_YIELD_READ  (1 << 0)
  23 #define RCU_YIELD_WRITE (1 << 1)
  24
  25 #define MAX_SLEEP 50
  26
  27 extern unsigned int rcu_yield_active;
  28 extern DECLARE_URCU_TLS(unsigned int, rcu_rand_yield);
  29
  30 #ifdef DEBUG_YIELD
  31 static inline void rcu_debug_yield_read(void)
  32 {
  33         if (rcu_yield_active & RCU_YIELD_READ)
  34                 if (rand_r(&URCU_TLS(rcu_rand_yield)) & 0x1)
  35                         usleep(rand_r(&URCU_TLS(rcu_rand_yield)) % MAX_SLEEP);
  36 }
  37
  38 static inline void rcu_debug_yield_write(void)
  39 {
  40         if (rcu_yield_active & RCU_YIELD_WRITE)
  41                 if (rand_r(&URCU_TLS(rcu_rand_yield)) & 0x1)
  42                         usleep(rand_r(&URCU_TLS(rcu_rand_yield)) % MAX_SLEEP);
  43 }
  44
  45 static inline void rcu_debug_yield_enable(unsigned int flags)
  46 {
  47         rcu_yield_active |= flags;
  48 }
  49
  50 static inline void rcu_debug_yield_disable(unsigned int flags)
  51 {
  52         rcu_yield_active &= ~flags;
  53 }
  54
  55 static inline void rcu_debug_yield_init(void)
  56 {
  57         URCU_TLS(rcu_rand_yield) = time(NULL) ^ (unsigned long) pthread_self();
  58 }
  59 #else /* DEBUG_YIELD */
  60 static inline void rcu_debug_yield_read(void)
  61 {
  62 }
  63
  64 static inline void rcu_debug_yield_write(void)
  65 {
  66 }
  67
  68 static inline void rcu_debug_yield_enable(
  69                 unsigned int flags __attribute__((unused)))
  70 {
  71 }
  72
  73 static inline void rcu_debug_yield_disable(
  74                 unsigned int flags __attribute__((unused)))
  75 {
  76 }
  77
  78 static inline void rcu_debug_yield_init(void)
  79 {
  80 }
  81 #endif
  82
  83 #endif /* URCU_TESTS_DEBUG_YIELD_H */