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picolibc: Add stdout buffering [v2]

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Add buffering so that USB back-ends get some batching for stdout

Signed-off-by: Keith Packard <keithp@keithp.com>

----

v2:
	Replace tabs with spaces.
This commit is contained in:
Keith Packard 2020-07-08 09:41:22 -07:00
parent 8c67544e7d
commit fda68c4149
1 changed files with 40 additions and 9 deletions
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49
sys/picolibc_syscalls_default/syscalls.c
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@ -61,23 +61,54 @@ int kill(pid_t pid, int sig)
return -1;
}
/* File descriptor pointers */
int picolibc_get(FILE *file)
#include "mutex.h"
static mutex_t picolibc_put_mutex = MUTEX_INIT;
#define PICOLIBC_STDOUT_BUFSIZE 64
static char picolibc_stdout[PICOLIBC_STDOUT_BUFSIZE];
static int picolibc_stdout_queued;
static void _picolibc_flush(void)
{
if (picolibc_stdout_queued) {
stdio_write(picolibc_stdout, picolibc_stdout_queued);
picolibc_stdout_queued = 0;
}
}
static int picolibc_put(char c, FILE *file)
{
(void)file;
mutex_lock(&picolibc_put_mutex);
picolibc_stdout[picolibc_stdout_queued++] = c;
if (picolibc_stdout_queued == PICOLIBC_STDOUT_BUFSIZE || c == '\n')
_picolibc_flush();
mutex_unlock(&picolibc_put_mutex);
return 1;
}
static int picolibc_flush(FILE *file)
{
(void)file;
mutex_lock(&picolibc_put_mutex);
_picolibc_flush();
mutex_unlock(&picolibc_put_mutex);
return 0;
}
static int picolibc_get(FILE *file)
{
(void)file;
picolibc_flush(NULL);
char c = 0;
stdio_read(&c, 1);
return c;
}
int picolibc_put(char c, FILE *file)
{
(void)file;
stdio_write(&c, 1);
return 1;
}
FILE picolibc_stdio =
FDEV_SETUP_STREAM(picolibc_put, picolibc_get, NULL, _FDEV_SETUP_RW);
FDEV_SETUP_STREAM(picolibc_put, picolibc_get, picolibc_flush, _FDEV_SETUP_RW);
FILE *const __iob[] = {
&picolibc_stdio, /* stdin */