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127 lines
5.1 KiB
127 lines
5.1 KiB
/* |
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Copyright (c) 2012, Broadcom Europe Ltd |
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All rights reserved. |
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions are met: |
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* Redistributions of source code must retain the above copyright |
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notice, this list of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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* Neither the name of the copyright holder nor the |
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names of its contributors may be used to endorse or promote products |
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derived from this software without specific prior written permission. |
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY |
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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/*============================================================================= |
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VideoCore OS Abstraction Layer - event flags implemented via a semaphore |
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=============================================================================*/ |
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#ifndef VCOS_GENERIC_EVENT_FLAGS_H |
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#define VCOS_GENERIC_EVENT_FLAGS_H |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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#include "interface/vcos/vcos_types.h" |
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/** |
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* \file |
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* |
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* This provides event flags (as per Nucleus Event Groups) based on a |
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* mutex, a semaphore (per waiting thread) and a timer (per waiting |
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* thread). |
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* |
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* The data structure is a 32 bit unsigned int (the current set of |
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* flags) and a linked list of clients waiting to be 'satisfied'. |
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* |
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* The mutex merely locks access to the data structure. If a client |
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* calls vcos_event_flags_get() and the requested bits are not already |
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* present, it then sleeps on its per-thread semaphore after adding |
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* this semaphore to the queue waiting. It also sets up a timer. |
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* |
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* The per-thread semaphore and timer are actually stored in the |
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* thread context (joinable thread). In future it may become necessary |
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* to support non-VCOS threads by using thread local storage to |
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* create these objects and associate them with the thread. |
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*/ |
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struct VCOS_EVENT_WAITER_T; |
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typedef struct VCOS_EVENT_FLAGS_T |
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{ |
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VCOS_UNSIGNED events; /**< Events currently set */ |
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VCOS_MUTEX_T lock; /**< Serialize access */ |
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struct |
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{ |
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struct VCOS_EVENT_WAITER_T *head; /**< List of threads waiting */ |
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struct VCOS_EVENT_WAITER_T *tail; /**< List of threads waiting */ |
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} waiters; |
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} VCOS_EVENT_FLAGS_T; |
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#define VCOS_OR 1 |
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#define VCOS_AND 2 |
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#define VCOS_CONSUME 4 |
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#define VCOS_OR_CONSUME (VCOS_OR | VCOS_CONSUME) |
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#define VCOS_AND_CONSUME (VCOS_AND | VCOS_CONSUME) |
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#define VCOS_EVENT_FLAG_OP_MASK (VCOS_OR|VCOS_AND) |
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VCOSPRE_ VCOS_STATUS_T VCOSPOST_ vcos_generic_event_flags_create(VCOS_EVENT_FLAGS_T *flags, const char *name); |
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VCOSPRE_ void VCOSPOST_ vcos_generic_event_flags_set(VCOS_EVENT_FLAGS_T *flags, |
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VCOS_UNSIGNED events, |
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VCOS_OPTION op); |
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VCOSPRE_ void VCOSPOST_ vcos_generic_event_flags_delete(VCOS_EVENT_FLAGS_T *); |
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VCOSPRE_ VCOS_STATUS_T VCOSPOST_ vcos_generic_event_flags_get(VCOS_EVENT_FLAGS_T *flags, |
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VCOS_UNSIGNED requested_events, |
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VCOS_OPTION op, |
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VCOS_UNSIGNED suspend, |
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VCOS_UNSIGNED *retrieved_events); |
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#ifdef VCOS_INLINE_BODIES |
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VCOS_INLINE_IMPL |
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VCOS_STATUS_T vcos_event_flags_create(VCOS_EVENT_FLAGS_T *flags, const char *name) { |
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return vcos_generic_event_flags_create(flags, name); |
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} |
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VCOS_INLINE_IMPL |
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void vcos_event_flags_set(VCOS_EVENT_FLAGS_T *flags, |
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VCOS_UNSIGNED events, |
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VCOS_OPTION op) { |
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vcos_generic_event_flags_set(flags, events, op); |
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} |
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VCOS_INLINE_IMPL |
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void vcos_event_flags_delete(VCOS_EVENT_FLAGS_T *f) { |
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vcos_generic_event_flags_delete(f); |
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} |
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VCOS_INLINE_IMPL |
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VCOS_STATUS_T vcos_event_flags_get(VCOS_EVENT_FLAGS_T *flags, |
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VCOS_UNSIGNED requested_events, |
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VCOS_OPTION op, |
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VCOS_UNSIGNED suspend, |
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VCOS_UNSIGNED *retrieved_events) { |
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return vcos_generic_event_flags_get(flags, requested_events, op, suspend, retrieved_events); |
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} |
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#endif /* VCOS_INLINE_BODIES */ |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif |
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