projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| a5544970 | 1 | /* Copyright (C) 2007-2019 Free Software Foundation, Inc. |
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2 | Contributed by Danny Smith <dannysmith@users.sourceforge.net> |
| 3 | ||
| f1f3453e TS |
4 | This file is part of the GNU Offloading and Multi Processing Library |
| 5 | (libgomp). | |
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6 | |
| 7 | Libgomp is free software; you can redistribute it and/or modify it | |
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8 | under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3, or (at your option) | |
| 10 | any later version. | |
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11 | |
| 12 | Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
| 748086b7 | 14 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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15 | more details. |
| 16 | ||
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17 | Under Section 7 of GPL version 3, you are granted additional |
| 18 | permissions described in the GCC Runtime Library Exception, version | |
| 19 | 3.1, as published by the Free Software Foundation. | |
| 20 | ||
| 21 | You should have received a copy of the GNU General Public License and | |
| 22 | a copy of the GCC Runtime Library Exception along with this program; | |
| 23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
| 24 | <http://www.gnu.org/licenses/>. */ | |
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25 | |
| 26 | /* This file contains system specific routines related to counting | |
| 27 | online processors and dynamic load balancing. It is expected that | |
| 28 | a system may well want to write special versions of each of these. | |
| 29 | ||
| 30 | The following implementation uses win32 API routines. */ | |
| 31 | ||
| 32 | #include "libgomp.h" | |
| 33 | #include <windows.h> | |
| 34 | ||
| 35 | /* Count the CPU's currently available to this process. */ | |
| a68ab351 | 36 | static unsigned int |
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37 | count_avail_process_cpus () |
| 38 | { | |
| 39 | DWORD_PTR process_cpus; | |
| 40 | DWORD_PTR system_cpus; | |
| 41 | ||
| 42 | if (GetProcessAffinityMask (GetCurrentProcess (), | |
| 43 | &process_cpus, &system_cpus)) | |
| 44 | { | |
| 45 | unsigned int count; | |
| 46 | for (count = 0; process_cpus != 0; process_cpus >>= 1) | |
| 47 | if (process_cpus & 1) | |
| 48 | count++; | |
| 49 | return count; | |
| 50 | } | |
| 51 | return 1; | |
| 52 | } | |
| 53 | ||
| 54 | /* At startup, determine the default number of threads. It would seem | |
| 55 | this should be related to the number of cpus available to the process. */ | |
| 56 | ||
| 57 | void | |
| 58 | gomp_init_num_threads (void) | |
| 59 | { | |
| a68ab351 | 60 | gomp_global_icv.nthreads_var = count_avail_process_cpus (); |
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61 | } |
| 62 | ||
| 63 | /* When OMP_DYNAMIC is set, at thread launch determine the number of | |
| 64 | threads we should spawn for this team. FIXME: How do we adjust for | |
| 65 | load average on MS Windows? */ | |
| 66 | ||
| 67 | unsigned | |
| 68 | gomp_dynamic_max_threads (void) | |
| 69 | { | |
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70 | unsigned int n_onln = count_avail_process_cpus (); |
| 71 | unsigned int nthreads_var = gomp_icv (false)->nthreads_var; | |
| 72 | return n_onln > nthreads_var ? nthreads_var : n_onln; | |
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73 | } |
| 74 | ||
| 75 | int | |
| 76 | omp_get_num_procs (void) | |
| 77 | { | |
| 78 | return count_avail_process_cpus (); | |
| 79 | } | |
| 80 | ||
| 81 | ialias (omp_get_num_procs) |