forked from KolibriOS/kolibrios
6496d04506
This version of menuetlibc was taken from revision 4743, right before I made any changes git-svn-id: svn://kolibrios.org@4973 a494cfbc-eb01-0410-851d-a64ba20cac60
45 lines
956 B
C
45 lines
956 B
C
#ifndef __QUEUE_H
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#define __QUEUE_H
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#include<menuet/os.h>
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#include<menuet/sem.h>
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typedef struct
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{
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int in_ptr,out_ptr,size;
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unsigned char * databuf;
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DECLARE_SEMAPHORE_S(q_lock);
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} __oe_queue_t;
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#define DECL_EMPTY_Q(n,sz,buf) __oe_queue_t n = {0,0,sz,buf,SEM_INIT}
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#define __OE_QUEUE_INQ(x,c) \
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({ \
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register int __ret,temp; \
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sem_lock(&(x)->q_lock); \
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temp=(x)->in_ptr+1; \
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if(temp>=(x)->size) temp=0; \
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if(temp==(x)->out_ptr) { __ret=-1; goto __OEQI_D; } \
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(x)->databuf[(x)->in_ptr]=(c)&0xFF; \
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(x)->in_ptr=temp; \
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__ret=0; \
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__OEQI_D: \
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sem_unlock(&(x)->q_lock); \
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__ret; })
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#define __OE_QUEUE_DEQ(x,c) \
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({ \
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register int __ret; \
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register unsigned char __tmp; \
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sem_lock(&(x)->q_lock); \
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if((x)->out_ptr==(x)->in_ptr) { __ret=-1; goto __OEQD_D; } \
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__tmp=(x)->databuf[(x)->out_ptr++]; \
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if((x)->out_ptr>=(x)->size) (x)->out_ptr=0; \
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__ret=0; \
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(c)=__tmp; \
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__OEQD_D: \
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sem_unlock(&(x)->q_lock); \
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__ret; })
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#endif
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