/src/hdf5/src/H5TSbarrier.h
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1 | | /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * |
2 | | * Copyright by The HDF Group. * |
3 | | * All rights reserved. * |
4 | | * * |
5 | | * This file is part of HDF5. The full HDF5 copyright notice, including * |
6 | | * terms governing use, modification, and redistribution, is contained in * |
7 | | * the LICENSE file, which can be found at the root of the source code * |
8 | | * distribution tree, or in https://www.hdfgroup.org/licenses. * |
9 | | * If you do not have access to either file, you may request a copy from * |
10 | | * help@hdfgroup.org. * |
11 | | * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ |
12 | | |
13 | | /* |
14 | | * Purpose: This file contains support for thread barrier operations, equivalent |
15 | | * to the pthread 'pthread_barrier_t' type and capabilities. |
16 | | * |
17 | | * Note: Because this threadsafety framework operates outside the library, |
18 | | * it does not use the error stack (although it does use error macros |
19 | | * that don't push errors on a stack) and only uses the "namecheck only" |
20 | | * FUNC_ENTER_* / FUNC_LEAVE_* macros. |
21 | | */ |
22 | | |
23 | | /****************/ |
24 | | /* Module Setup */ |
25 | | /****************/ |
26 | | |
27 | | /***********/ |
28 | | /* Headers */ |
29 | | /***********/ |
30 | | |
31 | | /****************/ |
32 | | /* Local Macros */ |
33 | | /****************/ |
34 | | |
35 | | /******************/ |
36 | | /* Local Typedefs */ |
37 | | /******************/ |
38 | | |
39 | | /********************/ |
40 | | /* Local Prototypes */ |
41 | | /********************/ |
42 | | |
43 | | /*********************/ |
44 | | /* Package Variables */ |
45 | | /*********************/ |
46 | | |
47 | | /*****************************/ |
48 | | /* Library Private Variables */ |
49 | | /*****************************/ |
50 | | |
51 | | /*******************/ |
52 | | /* Local Variables */ |
53 | | /*******************/ |
54 | | |
55 | | /*-------------------------------------------------------------------------- |
56 | | * Function: H5TS_barrier_wait |
57 | | * |
58 | | * Purpose: Wait at a barrier. |
59 | | * |
60 | | * Note: Similar to pthread_barrier_wait, a barrier may be reused |
61 | | * multiple times without intervening calls to H5TS_barrier_init. |
62 | | * |
63 | | * Return: Non-negative on success / Negative on failure |
64 | | * |
65 | | *-------------------------------------------------------------------------- |
66 | | */ |
67 | | static inline herr_t |
68 | | H5TS_barrier_wait(H5TS_barrier_t *barrier) |
69 | 0 | { |
70 | 0 | if (H5_UNLIKELY(NULL == barrier)) |
71 | 0 | return FAIL; |
72 | 0 |
|
73 | 0 | #ifdef H5_HAVE_PTHREAD_BARRIER |
74 | 0 | { |
75 | 0 | int ret = pthread_barrier_wait(barrier); |
76 | 0 | if (H5_UNLIKELY(ret != 0 && ret != PTHREAD_BARRIER_SERIAL_THREAD)) |
77 | 0 | return FAIL; |
78 | 0 | } |
79 | 0 | #else |
80 | 0 | { |
81 | 0 | const unsigned my_generation = H5TS_atomic_load_uint(&barrier->generation); |
82 | 0 |
|
83 | 0 | /* When the last thread enters, reset the openings & bump the generation */ |
84 | 0 | if (1 == H5TS_atomic_fetch_sub_uint(&barrier->openings, 1)) { |
85 | 0 | H5TS_atomic_store_uint(&barrier->openings, barrier->count); |
86 | 0 | H5TS_atomic_fetch_add_uint(&barrier->generation, 1); |
87 | 0 | } |
88 | 0 | else { |
89 | 0 | /* Not the last thread, wait for the generation to change */ |
90 | 0 | while (H5TS_atomic_load_uint(&barrier->generation) == my_generation) |
91 | 0 | H5TS_thread_yield(); |
92 | 0 | } |
93 | 0 | } |
94 | 0 | #endif |
95 | 0 |
|
96 | 0 | return SUCCEED; |
97 | 0 | } /* end H5TS_barrier_wait() */ Unexecuted instantiation: H5.c:H5TS_barrier_wait Unexecuted instantiation: H5Eint.c:H5TS_barrier_wait |