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don't fire off cursor location requests unless none are outstanding #2105

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nick black 2021-11-21 15:30:32 -05:00
parent 62a863bea8
commit 3c06ca496f
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1 changed files with 5 additions and 1 deletions
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6
src/lib/in.c
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@ -75,6 +75,7 @@ typedef struct inputctx {
// ringbuffers for processed, structured input
cursorloc* csrs; // cursor reports are dumped here
ncinput* inputs; // processed input is dumped here
int coutstanding; // outstanding cursor location requests
int csize, isize; // total number of slots in csrs/inputs
int cvalid, ivalid; // population count of csrs/inputs
int cwrite, iwrite; // slot where we'll write the next csr/input;
@ -1442,6 +1443,7 @@ create_inputctx(tinfo* ti, FILE* infp, int lmargin, int tmargin, int rmargin,
if(set_fd_nonblocking(i->stdinfd, 1, &ti->stdio_blocking_save) == 0){
i->termfd = tty_check(i->stdinfd) ? -1 : get_tty_fd(infp);
memset(i->initdata, 0, sizeof(*i->initdata));
i->coutstanding = 1; // one in initial request set
i->initdata->qterm = ti->qterm;
i->initdata->cursory = -1;
i->initdata->cursorx = -1;
@ -2205,12 +2207,14 @@ uint32_t ncdirect_get(ncdirect* n, const struct timespec* absdl, ncinput* ni){
int get_cursor_location(inputctx* ictx, const char* u7, unsigned* y, unsigned* x){
pthread_mutex_lock(&ictx->clock);
while(ictx->cvalid == 0){
while(ictx->cvalid == 0 && ictx->coutstanding == 0){
if(tty_emit(u7, ictx->ti->ttyfd)){
return -1;
}
++ictx->coutstanding;
pthread_cond_wait(&ictx->ccond, &ictx->clock);
}
--ictx->coutstanding;
const cursorloc* cloc = &ictx->csrs[ictx->cread];
if(++ictx->cread == ictx->csize){
ictx->cread = 0;