70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
#include "input.h"
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#include <pthread.h>
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#include "platform.h"
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struct InputRecord *buf_get(struct InputBuffer *buf, size_t i) {
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return buf->recs + (buf->start + i) % IO_BUF_SIZE;
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}
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size_t max_size(size_t a, size_t b) {
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return a > b ? a : b;
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}
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void InputBufferTransfer(struct InputBuffer *dest, struct InputBuffer *src)
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{
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size_t copy_amt = IO_BUF_SIZE - max_size(dest->len, src->len);
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for (size_t i = 0; i < copy_amt; i++)
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*buf_get(dest, dest->len + i) = *buf_get(src, i);
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if (copy_amt < src->len)
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src->start += copy_amt;
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src->len -= copy_amt;
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dest->len += copy_amt;
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}
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void InputBufferAdd(struct InputBuffer *buf, struct InputRecord *rec)
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{
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*buf_get(buf, buf->len++) = *rec;
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}
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struct input_args {
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struct InputBuffer *buf;
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pthread_mutex_t *mutex;
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};
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void *input_thread_loop(struct input_args *args)
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{
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struct InputBuffer *buf = args->buf;
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pthread_mutex_t *mutex = args->mutex;
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free(args);
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struct InputBuffer tmp_buf = { .len = 0, .start = 0 };
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while (true) {
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if (!PlatformReadInput(&tmp_buf))
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return false;
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pthread_mutex_lock(mutex);
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{
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InputBufferTransfer(&tmp_buf, buf);
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}
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pthread_mutex_unlock(mutex);
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}
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return nullptr;
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}
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bool CreateInputThread(struct InputBuffer *buf, pthread_mutex_t *mutex)
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{
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struct input_args *args = malloc(sizeof(struct input_args));
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*args = (struct input_args) {
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.buf = buf,
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.mutex = mutex,
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};
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pthread_t thread;
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return pthread_create(&thread, nullptr, input_thread_loop, args) == 0;
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} |