87 lines
2 KiB
C
87 lines
2 KiB
C
#include "input.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 min_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 = min_size(IO_BUF_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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void *input_thread_loop(void *arg)
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{
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struct InputThreadHandle *hand = arg;
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struct InputBuffer tmp_buf = { .len = 0, .start = 0 };
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while (!hand->is_terminating) {
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if (!PlatformReadInput(&tmp_buf)) {
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hand->err = true;
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return nullptr;
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}
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hand->err = pthread_mutex_lock(&hand->mutex);
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if (hand->err)
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return nullptr;
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while (tmp_buf.len == IO_BUF_SIZE) {
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hand->err = pthread_cond_wait(&hand->buf_read, &hand->mutex);
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if (hand->err)
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return nullptr;
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}
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InputBufferTransfer(hand->buf, &tmp_buf);
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hand->err = pthread_mutex_unlock(&hand->mutex);
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if (hand->err)
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return nullptr;
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}
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return nullptr;
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}
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bool BeginInputThread(struct InputThreadHandle *hand, struct InputBuffer *buf)
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{
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hand->buf = buf;
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hand->mutex = PTHREAD_MUTEX_INITIALIZER;
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hand->buf_read = PTHREAD_COND_INITIALIZER;
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hand->err = 0;
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return pthread_create(&hand->thread, nullptr, input_thread_loop, hand) == 0;
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}
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bool EndInputThread(struct InputThreadHandle *hand)
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{
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hand->is_terminating = true;
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if (!PlatformStopInput())
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return false;
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if (!pthread_mutex_destroy(&hand->mutex))
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return false;
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if (!pthread_join(hand->thread, nullptr))
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return false;
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return true;
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} |