| 1 | #ifndef _LTTNG_GETCPU_H |
| 2 | #define _LTTNG_GETCPU_H |
| 3 | |
| 4 | /* |
| 5 | * Copyright (c) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 6 | * |
| 7 | * This library is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; only |
| 10 | * version 2.1 of the License. |
| 11 | * |
| 12 | * This library is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with this library; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #define _GNU_SOURCE |
| 23 | #include <urcu/compiler.h> |
| 24 | #include <sched.h> |
| 25 | |
| 26 | #ifdef UST_VALGRIND |
| 27 | |
| 28 | /* |
| 29 | * Fallback on cpu 0 if liblttng-ust is build with Valgrind support. |
| 30 | * get_cpu() returns the current CPU number. It may change due to |
| 31 | * migration, so it is only statistically accurate. |
| 32 | */ |
| 33 | static inline |
| 34 | int lttng_ust_get_cpu(void) |
| 35 | { |
| 36 | return 0; |
| 37 | } |
| 38 | |
| 39 | #else |
| 40 | |
| 41 | /* |
| 42 | * If getcpu is not implemented in the kernel, use cpu 0 as fallback. |
| 43 | */ |
| 44 | static inline |
| 45 | int lttng_ust_get_cpu(void) |
| 46 | { |
| 47 | int cpu; |
| 48 | |
| 49 | cpu = sched_getcpu(); |
| 50 | if (caa_unlikely(cpu < 0)) |
| 51 | return 0; |
| 52 | return cpu; |
| 53 | } |
| 54 | |
| 55 | #endif |
| 56 | |
| 57 | #endif /* _LTTNG_GETCPU_H */ |