| 1 | /* Copyright (c) 2007-2009, Stanford University |
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| 2 | * All rights reserved. |
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| 3 | * |
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| 4 | * Redistribution and use in source and binary forms, with or without |
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| 5 | * modification, are permitted provided that the following conditions are met: |
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| 6 | * * Redistributions of source code must retain the above copyright |
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| 7 | * notice, this list of conditions and the following disclaimer. |
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| 8 | * * Redistributions in binary form must reproduce the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer in the |
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| 10 | * documentation and/or other materials provided with the distribution. |
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| 11 | * * Neither the name of Stanford University nor the names of its |
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| 12 | * contributors may be used to endorse or promote products derived from |
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| 13 | * this software without specific prior written permission. |
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| 14 | * |
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| 15 | * THIS SOFTWARE IS PROVIDED BY STANFORD UNIVERSITY ``AS IS'' AND ANY |
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| 16 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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| 17 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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| 18 | * DISCLAIMED. IN NO EVENT SHALL STANFORD UNIVERSITY BE LIABLE FOR ANY |
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| 19 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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| 20 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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| 21 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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| 22 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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| 24 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 25 | */ |
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| 26 | |
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| 27 | /* OS specific headers and defines. */ |
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| 28 | #include <sched.h> |
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| 29 | |
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| 30 | #include <stdlib.h> |
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| 31 | #include <unistd.h> |
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| 32 | #include <sys/types.h> |
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| 33 | #include <assert.h> |
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| 34 | |
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| 35 | #include "processor.h" |
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| 36 | #include "memory.h" |
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| 37 | #include <pthread.h> |
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| 38 | |
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| 39 | static int num_cpus = 0; |
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| 40 | |
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| 41 | /* Query the number of CPUs online. */ |
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| 42 | int proc_get_num_cpus (void) |
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| 43 | { |
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| 44 | char *num_proc_str; |
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| 45 | |
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| 46 | if(num_cpus == 0) |
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| 47 | { |
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| 48 | num_cpus = sysconf(_SC_NPROCESSORS_ONLN); |
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| 49 | |
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| 50 | /* Check if the user specified a different number of processors. */ |
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| 51 | if ((num_proc_str = getenv("MAPRED_NPROCESSORS"))) |
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| 52 | { |
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| 53 | int temp = atoi(num_proc_str); |
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| 54 | if (temp < 1 || temp > num_cpus) |
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| 55 | num_cpus = 0; |
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| 56 | else |
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| 57 | num_cpus = temp; |
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| 58 | } |
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| 59 | } |
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| 60 | |
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| 61 | return num_cpus; |
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| 62 | } |
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| 63 | |
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| 64 | /* Bind the calling thread to run on CPU_ID. |
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| 65 | Returns 0 if successful, -1 if failed. */ |
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| 66 | int proc_bind_thread (int cpu_id) |
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| 67 | { |
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| 68 | return 0; |
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| 69 | } |
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| 70 | |
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| 71 | int proc_unbind_thread () |
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| 72 | { |
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| 73 | return 0; |
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| 74 | } |
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| 75 | |
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| 76 | /* Test whether processor CPU_ID is available. */ |
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| 77 | bool proc_is_available (int cpu_id) |
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| 78 | { |
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| 79 | return true; |
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| 80 | } |
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| 81 | |
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| 82 | int proc_get_cpuid (void) |
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| 83 | { |
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| 84 | int cpu_id = -1; |
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| 85 | int ret; |
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| 86 | |
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| 87 | ret = pthread_attr_getcpuid_np(&cpu_id); |
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| 88 | |
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| 89 | return (ret == 0) ? cpu_id : -1; |
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| 90 | } |
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