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/* vi:set ts=8 sts=4 sw=4 noet:
*
* VIM - Vi IMproved by Bram Moolenaar
* BeBox port Copyright 1997 by Olaf Seibert.
*
* Do ":help uganda" in Vim to read copying and usage conditions.
* Do ":help credits" in Vim to see a list of people who contributed.
* See README.txt for an overview of the Vim source code.
*/
/*
* os_beos.c Additional stuff for BeOS (rest is in os_unix.c)
*/
#include <float.h>
#include <termios.h>
#ifndef PROTO
# include <kernel/OS.h>
#endif
#include "vim.h"
#if USE_THREAD_FOR_INPUT_WITH_TIMEOUT
#ifdef PROTO // making prototypes on Unix
#define sem_id int
#define thread_id int
#endif
char_u charbuf;
signed char charcount;
sem_id character_present;
sem_id character_wanted;
thread_id read_thread_id;
#define TRY_ABORT 0 // This code does not work so turn it off.
#if TRY_ABORT
static void
mostly_ignore(int sig)
{
}
#endif
static long
read_thread(void *dummy)
{
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
#if TRY_ABORT
signal(SIGUSR1, mostly_ignore);
#endif
for (;;) {
if (acquire_sem(character_wanted) != B_NO_ERROR)
break;
charcount = read(read_cmd_fd, &charbuf, 1);
release_sem(character_present);
}
return 0;
}
void
beos_cleanup_read_thread(void)
{
if (character_present > 0)
delete_sem(character_present);
character_present = 0;
if (read_thread_id > 0)
kill_thread(read_thread_id);
read_thread_id = 0;
}
#endif
/*
* select() emulation. Hopefully, in DR9 there will be something
* useful supplied by the system. ... Alas, not. Not in AAPR, nor
* in PR or even PR2... R3 then maybe? I don't think so!
*/
int
beos_select(int nbits,
struct fd_set *rbits,
struct fd_set *wbits,
struct fd_set *ebits,
struct timeval *timeout)
{
bigtime_t tmo;
if (nbits == 0) {
// select is purely being used for delay
snooze(timeout->tv_sec * 1e6 + timeout->tv_usec);
return 0;
}
#if 0
/*
* This does not seem to work either. Reads here are not supposed to
* block indefinitely, yet they do. This is most annoying.
*/
if (FD_ISSET(0, rbits)) {
char cbuf[1];
int count;
struct termios told;
struct termios tnew;
tcgetattr(0, &told);
tnew = told;
tnew.c_lflag &= ~ICANON;
tnew.c_cc[VMIN] = 0;
tnew.c_cc[VTIME] = timeout->tv_sec * 10 + timeout->tv_usec / 100000;
tcsetattr(0, TCSANOW, &tnew);
count = read(0, &cbuf, sizeof(cbuf));
tcsetattr(0, TCSANOW, &told);
if (count > 0) {
add_to_input_buf(&cbuf[0], count);
return 1;
}
return 0;
}
#endif
#if USE_THREAD_FOR_INPUT_WITH_TIMEOUT
/*
* Check if the operation is really on stdin...
*/
if (FD_ISSET(read_cmd_fd, rbits))
{
int acquired;
/*
* Is this the first time through?
* Then start up the thread and initialise the semaphores.
*/
if (character_present == 0) {
character_present = create_sem(0, "vim character_present");
character_wanted = create_sem(1, "vim character_wanted");
read_thread_id = spawn_thread(read_thread, "vim async read",
B_NORMAL_PRIORITY, NULL);
atexit(beos_cleanup_read_thread);
resume_thread(read_thread_id);
}
// timeout == NULL means "indefinitely"
if (timeout) {
tmo = timeout->tv_sec * 1e6 + timeout->tv_usec;
// 0 means "don't wait, which is impossible to do exactly.
if (tmo == 0)
tmo = 1.0;
}
#if TRY_ABORT
release_sem(character_wanted);
#endif
if (timeout)
acquired = acquire_sem_etc(character_present, 1, B_TIMEOUT, tmo);
else
acquired = acquire_sem(character_present);
if (acquired == B_NO_ERROR) {
if (charcount > 0) {
add_to_input_buf(&charbuf, 1);
#if !TRY_ABORT
release_sem(character_wanted);
#endif
return 1;
} else {
#if !TRY_ABORT
release_sem(character_wanted);
#endif
return 0;
}
}
#if TRY_ABORT
else {
/*
* Timeout occurred. Break the read() call by sending
* a signal. Problem: it may be just read()ing it now.
* Therefore we still have to finish the handshake with
* the thread and maybe remember the character.
*/
kill(read_thread_id, SIGUSR1);
/*
* If some other error occurred, don't hang now.
* (We will most likely hang later anyway...)
*/
if (acquired == B_TIMED_OUT)
acquire_sem(character_present);
if (charcount > 0) {
add_to_input_buf(&charbuf, 1);
return 1;
}
return 0;
}
#endif
}
#endif
return 0;
}
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