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sys: newlib: remove _read_r() race

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This commit is contained in:
Kaspar Schleiser 2015-06-01 12:18:39 +02:00
parent 4b1e1582af
commit 5549d0493d
1 changed files with 5 additions and 3 deletions
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8
sys/newlib/syscalls.c
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@ -203,11 +203,13 @@ int _open_r(struct _reent *r, const char *name, int mode)
int _read_r(struct _reent *r, int fd, void *buffer, unsigned int count)
{
#ifndef MODULE_UART0
int res;
mutex_lock(&uart_rx_mutex);
unsigned state = disableIRQ();
count = count < rx_buf.avail ? count : rx_buf.avail;
return ringbuffer_get(&rx_buf, (char*)buffer, count);
res = ringbuffer_get(&rx_buf, (char*)buffer, count);
restoreIRQ(state);
return res;
#else
char *res = (char*)buffer;
res[0] = (char)uart0_readc();