FD.io VPP  v19.04.4-rc0-5-ge88582fac
Vector Packet Processing
smp.h
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1 /*
2  * Copyright (c) 2015 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
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11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 /*
16  Copyright (c) 2001-2005 Eliot Dresselhaus
17 
18  Permission is hereby granted, free of charge, to any person obtaining
19  a copy of this software and associated documentation files (the
20  "Software"), to deal in the Software without restriction, including
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22  distribute, sublicense, and/or sell copies of the Software, and to
23  permit persons to whom the Software is furnished to do so, subject to
24  the following conditions:
25 
26  The above copyright notice and this permission notice shall be
27  included in all copies or substantial portions of the Software.
28 
29  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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35  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
36 */
37 
38 #ifndef included_clib_smp_h
39 #define included_clib_smp_h
40 
41 #include <vppinfra/cache.h>
42 #include <vppinfra/os.h> /* for os_panic */
43 
44 #if defined (i386) || defined (__x86_64__)
45 #define clib_smp_pause() do { asm volatile ("pause"); } while (0)
46 #elif defined (__aarch64__) || defined (__arm__)
47 #define clib_smp_pause() do { asm volatile ("isb" ::: "memory"); } while (0)
48 #endif
49 
50 #ifndef clib_smp_pause
51 #define clib_smp_pause() do { } while (0)
52 #endif
53 
54 #ifdef CLIB_UNIX
55 #include <sched.h>
56 
57 always_inline void
59 {
60  sched_yield ();
61 }
62 #else
63 always_inline void
64 os_sched_yield (void)
65 {
66  clib_smp_pause ();
67 }
68 #endif
69 
70 
71 #endif /* included_clib_smp_h */
72 
73 /*
74  * fd.io coding-style-patch-verification: ON
75  *
76  * Local Variables:
77  * eval: (c-set-style "gnu")
78  * End:
79  */
static void os_sched_yield(void)
Definition: smp.h:58
#define always_inline
Definition: clib.h:98
#define clib_smp_pause()
Definition: smp.h:45