| 1 | /*
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| 2 | * pthread.c - User level <semaphore> library implementation.
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| 3 | *
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| 4 | * Author Alain Greiner (2016,2017,2018)
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| 5 | *
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| 6 | * Copyright (c) UPMC Sorbonne Universites
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| 7 | *
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| 8 | * This file is part of ALMOS-MKH.
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| 9 | *
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| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it
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| 11 | * under the terms of the GNU General Public License as published by
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| 12 | * the Free Software Foundation; version 2.0 of the License.
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| 13 | *
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| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but
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| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 17 | * General Public License for more details.
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| 18 | *
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| 19 | * You should have received a copy of the GNU General Public License
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| 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation,
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| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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| 22 | */
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| 23 |
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| 24 | #include <hal_user.h>
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| 25 | #include <hal_shared_types.h>
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| 26 | #include <semaphore.h>
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| 27 | #include <shared_semaphore.h>
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| 28 | #include <syscalls_numbers.h>
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| 29 | #include <stdio.h>
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| 30 |
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| 31 | /////////////////////////////////
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| 32 | int sem_init( sem_t * sem,
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| 33 | int pshared,
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| 34 | unsigned int init_value )
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| 35 | {
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| 36 | if( pshared )
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| 37 | {
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| 38 | printf("[ERROR] in %s : pshared argument must be zero\n", __FUNCTION__ );
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| 39 | return -1;
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| 40 | }
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| 41 |
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| 42 | return hal_user_syscall( SYS_SEM,
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| 43 | (reg_t)sem,
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| 44 | SEM_INIT,
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| 45 | (reg_t)init_value,
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| 46 | 0 ) ;
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| 47 | }
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| 48 |
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| 49 | ///////////////////////////
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| 50 | int sem_wait( sem_t * sem )
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| 51 | {
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| 52 | return hal_user_syscall( SYS_SEM,
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| 53 | (reg_t)sem,
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| 54 | SEM_WAIT, 0, 0 );
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| 55 | }
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| 56 |
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| 57 | ///////////////////////////
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| 58 | int sem_post( sem_t * sem )
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| 59 | {
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| 60 | return hal_user_syscall( SYS_SEM,
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| 61 | (reg_t)sem,
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| 62 | SEM_POST, 0, 0 );
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| 63 | }
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| 64 |
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| 65 | //////////////////////////////
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| 66 | int sem_destroy( sem_t * sem )
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| 67 | {
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| 68 | return hal_user_syscall( SYS_SEM,
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| 69 | (reg_t)sem,
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| 70 | SEM_DESTROY, 0, 0 );
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| 71 | }
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| 72 |
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| 73 | //////////////////////////////
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| 74 | int sem_getvalue( sem_t * sem,
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| 75 | int * current_value )
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| 76 | {
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| 77 | return hal_user_syscall( SYS_SEM,
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| 78 | (reg_t)sem,
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| 79 | SEM_GETVALUE,
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| 80 | 0,
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| 81 | (reg_t)current_value );
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| 82 | }
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| 83 |
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| 84 |
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| 85 | // Local Variables:
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| 86 | // tab-width: 4
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| 87 | // c-basic-offset: 4
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| 88 | // c-file-offsets:((innamespace . 0)(inline-open . 0))
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| 89 | // indent-tabs-mode: nil
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| 90 | // End:
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| 91 | // vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4
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| 92 |
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