| [1] | 1 | /* |
|---|
| 2 | * kern/kcond_var.h - kernel condition variables synchronization |
|---|
| 3 | * |
|---|
| 4 | * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless |
|---|
| 5 | * Copyright (c) 2011,2012 UPMC Sorbonne Universites |
|---|
| 6 | * |
|---|
| 7 | * This file is part of ALMOS-kernel. |
|---|
| 8 | * |
|---|
| 9 | * ALMOS-kernel is free software; you can redistribute it and/or modify it |
|---|
| 10 | * under the terms of the GNU General Public License as published by |
|---|
| 11 | * the Free Software Foundation; version 2.0 of the License. |
|---|
| 12 | * |
|---|
| 13 | * ALMOS-kernel is distributed in the hope that it will be useful, but |
|---|
| 14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
|---|
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|---|
| 16 | * General Public License for more details. |
|---|
| 17 | * |
|---|
| 18 | * You should have received a copy of the GNU General Public License |
|---|
| 19 | * along with ALMOS-kernel; if not, write to the Free Software Foundation, |
|---|
| 20 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
|---|
| 21 | */ |
|---|
| 22 | |
|---|
| 23 | #ifndef _KCOND_VAR_H_ |
|---|
| 24 | #define _KCOND_VAR_H_ |
|---|
| 25 | |
|---|
| 26 | #include <types.h> |
|---|
| 27 | #include <spinlock.h> |
|---|
| 28 | #include <wait_queue.h> |
|---|
| 29 | |
|---|
| 30 | /////////////////////////////////////////////////// |
|---|
| 31 | /// Public Section /// |
|---|
| 32 | /////////////////////////////////////////////////// |
|---|
| 33 | |
|---|
| 34 | /** Kernel Condition Variable Sync Type */ |
|---|
| 35 | typedef struct wait_queue_s kcv_t; |
|---|
| 36 | |
|---|
| 37 | /** Initialize CondVar */ |
|---|
| 38 | #define kcv_init(cv,name) |
|---|
| 39 | |
|---|
| 40 | /** Wait on CondVar until condition completion */ |
|---|
| 41 | #define kcv_wait(cv,lock) |
|---|
| 42 | |
|---|
| 43 | /** Signal (notifiy) CondVar and Wakeup one waiting thread */ |
|---|
| 44 | #define kcv_signal(cv) |
|---|
| 45 | |
|---|
| 46 | /** Destroy CondVar */ |
|---|
| 47 | #define kcv_destroy(cv) |
|---|
| 48 | |
|---|
| 49 | /** Broadcast CondVar and return the number of notified threads */ |
|---|
| 50 | static inline uint_t kcv_broadcast(kcv_t *cv); |
|---|
| 51 | |
|---|
| 52 | |
|---|
| 53 | /////////////////////////////////////////////////// |
|---|
| 54 | /// Private Section /// |
|---|
| 55 | /////////////////////////////////////////////////// |
|---|
| 56 | |
|---|
| 57 | #undef kcv_init |
|---|
| 58 | #define kcv_init(_cv,_name) \ |
|---|
| 59 | do{ \ |
|---|
| 60 | wait_queue_init((_cv), (_name)); \ |
|---|
| 61 | }while(0) |
|---|
| 62 | |
|---|
| 63 | #undef kcv_wait |
|---|
| 64 | #define kcv_wait(_cv,_lock) \ |
|---|
| 65 | do{ \ |
|---|
| 66 | wait_on((_cv), WAIT_LAST); \ |
|---|
| 67 | spinlock_unlock_nosched((_lock)); \ |
|---|
| 68 | sched_sleep(CURRENT_THREAD); \ |
|---|
| 69 | spinlock_lock((_lock)); \ |
|---|
| 70 | }while(0) |
|---|
| 71 | |
|---|
| 72 | #undef kcv_signal |
|---|
| 73 | #define kcv_signal(_cv) \ |
|---|
| 74 | do{ \ |
|---|
| 75 | (void)wakeup_one((_cv), WAIT_ANY); \ |
|---|
| 76 | }while(0) |
|---|
| 77 | |
|---|
| 78 | static inline uint_t kcv_broadcast(kcv_t *cv) |
|---|
| 79 | { |
|---|
| 80 | return wakeup_all(cv); |
|---|
| 81 | } |
|---|
| 82 | |
|---|
| 83 | #undef kcv_destroy |
|---|
| 84 | #define kcv_destroy(_cv) \ |
|---|
| 85 | do{ \ |
|---|
| 86 | if(!(wait_queue_isEmpty((_cv)))) \ |
|---|
| 87 | printk(ERROR,"ERROR: %s: kcv [%s] is busy\n", __FUNCTION__, (_cv)->name); \ |
|---|
| 88 | }while(0) |
|---|
| 89 | |
|---|
| 90 | #endif /* _KCOND_VAR_H_ */ |
|---|
