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42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
#include <unistd.h>
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#include <sys/time.h>
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#include <errno.h>
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#include "io_internal.h"
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int64 io_canread() {
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io_entry* e;
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if (first_readable==-1)
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#ifdef HAVE_SIGIO
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{
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if (alt_firstread>=0 && (e=array_get(&io_fds,sizeof(io_entry),alt_firstread)) && e->canread) {
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debug_printf(("io_canread: normal read queue is empty, swapping in alt read queue (starting with %ld)\n",alt_firstread));
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first_readable=alt_firstread;
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alt_firstread=-1;
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} else
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return -1;
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}
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#else
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return -1;
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#endif
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for (;;) {
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int64 r;
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e=array_get(&io_fds,sizeof(io_entry),first_readable);
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if (!e) break;
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r=first_readable;
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first_readable=e->next_read;
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e->next_read=-1;
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debug_printf(("io_canread: dequeue %lld from normal read queue (next is %ld)\n",r,first_readable));
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if (e->wantread && e->canread) {
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#ifdef HAVE_SIGIO
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e->next_read=alt_firstread;
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alt_firstread=r;
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debug_printf(("io_canread: enqueue %ld in alt read queue (next is %ld)\n",alt_firstread,e->next_read));
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if (io_waitmode!=_SIGIO)
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#endif
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e->canread=0;
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return r;
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}
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}
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return -1;
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}
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