4.104.114.84.95
Last change
on this file since 48bfd992 was
48bfd992,
checked in by Joel Sherrill <joel.sherrill@…>, on 11/30/99 at 19:58:02
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Renamed shm.h to shm_driver.h to avoid conflicts with POSIX shm.h.
Renamed file shmsupp/intr.c in some BSPs to shmsupp/cause_intr.c to
avoid conflict with rtems/src/intr.c (Classic API Interrupt Manager).
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-
Property mode set to
100644
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File size:
1.4 KB
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Rev | Line | |
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[8961188] | 1 | /* Shared Memory Lock Routines |
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| 2 | * |
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| 3 | * This shared memory locked queue support routine need to be |
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| 4 | * able to lock the specified locked queue. Interrupts are |
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| 5 | * disabled while the queue is locked to prevent preemption |
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| 6 | * and deadlock when two tasks poll for the same lock. |
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| 7 | * previous level. |
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| 8 | * |
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| 9 | * COPYRIGHT (c) 1989-1997. |
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| 10 | * On-Line Applications Research Corporation (OAR). |
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| 11 | * Copyright assigned to U.S. Government, 1994. |
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| 12 | * |
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| 13 | * The license and distribution terms for this file may in |
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| 14 | * the file LICENSE in this distribution or at |
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| 15 | * http://www.OARcorp.com/rtems/license.html. |
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| 16 | * |
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| 17 | * $Id$ |
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| 18 | */ |
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| 19 | |
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| 20 | #include <rtems.h> |
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| 21 | #include <bsp.h> |
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[48bfd992] | 22 | #include <shm_driver.h> |
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[8961188] | 23 | |
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| 24 | typedef volatile unsigned int volint; |
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| 25 | |
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| 26 | /* |
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| 27 | * Shm_Initialize_lock |
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| 28 | * |
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| 29 | * Initialize the lock for the specified locked queue. |
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| 30 | */ |
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| 31 | |
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| 32 | void Shm_Initialize_lock( |
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| 33 | Shm_Locked_queue_Control *lq_cb |
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| 34 | ) |
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| 35 | { |
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| 36 | /* nothing required -- done implicitly by device tree */ |
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| 37 | } |
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| 38 | |
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| 39 | /* void _Shm_Lock( &lq_cb ) |
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| 40 | * |
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| 41 | * This shared memory locked queue support routine locks the |
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| 42 | * specified locked queue. It disables interrupts to prevent |
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| 43 | * a deadlock condition. |
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| 44 | */ |
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| 45 | |
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| 46 | void Shm_Lock( |
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| 47 | Shm_Locked_queue_Control *lq_cb |
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| 48 | ) |
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| 49 | { |
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| 50 | volint *p = (volint *)0xc0010000; |
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| 51 | |
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| 52 | (void) p[1]; |
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| 53 | } |
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| 54 | |
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| 55 | /* |
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| 56 | * Shm_Unlock |
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| 57 | * |
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| 58 | * Unlock the lock for the specified locked queue. |
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| 59 | */ |
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| 60 | |
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| 61 | void Shm_Unlock( |
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| 62 | Shm_Locked_queue_Control *lq_cb |
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| 63 | ) |
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| 64 | { |
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| 65 | volint *p = (volint *)0xc0010000; |
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| 66 | |
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| 67 | (void) p[2]; |
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| 68 | } |
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| 69 | |
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