33 lines
1.0 KiB
C
33 lines
1.0 KiB
C
#pragma once
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// ke_queue.h - fixed-depth message queue
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// Processes share an address space, so a pointer in Param[] is valid
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// on both sides. The queue is only a synchronisation and ordering tool.
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#include <stdint.h>
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#include <stdbool.h>
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#include <ob_object.h>
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#include <ke_spinlock.h>
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#include <ke_list.h>
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#include <ke_status.h>
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#define QUEUE_MESSAGE_SIZE 64 /* bytes, fixed */
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#define QUEUE_DEPTH 256
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typedef struct QUEUE_MESSAGE {
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uint32_t Type;
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uint32_t Flags;
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uint64_t Param[6]; /* 48 bytes of payload */
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} QUEUE_MESSAGE; /* total: 64 bytes */
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typedef struct QUEUE {
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OBJECT Header;
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SPINLOCK Lock;
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QUEUE_MESSAGE Ring[QUEUE_DEPTH];
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uint32_t Head, Tail, Count;
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LIST_ENTRY SendWaiters;
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LIST_ENTRY RecvWaiters;
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} QUEUE;
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KSTATUS QueueCreate(QUEUE **out);
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KSTATUS KeSendMessage(QUEUE* queue, const QUEUE_MESSAGE* msg, bool blocking);
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KSTATUS KeReceiveMessage(QUEUE* queue, QUEUE_MESSAGE* msg, bool blocking);
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