diff options
author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-10-16 14:35:12 +0200 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-10-18 07:23:29 +0200 |
commit | c980eaff1d10cb169ba22ce00e75dae318df21f1 (patch) | |
tree | c7ccb44a122fff63f833c49a8ce4c49b601847f5 | |
parent | 143c8d0d948b31f7c4b40e3d7eb7ebe0b80b4915 (diff) |
console: Be fair in simple console read
Wait for one tick in case no character is available after a call to
getchark(). Otherwise the system is constantly busy within an input
loop (for example in the RTEMS shell). The polled Termios driver uses
the same approach.
-rw-r--r-- | cpukit/libcsupport/src/consolesimpleread.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/cpukit/libcsupport/src/consolesimpleread.c b/cpukit/libcsupport/src/consolesimpleread.c index a796e4380f..737b441d99 100644 --- a/cpukit/libcsupport/src/consolesimpleread.c +++ b/cpukit/libcsupport/src/consolesimpleread.c @@ -33,9 +33,14 @@ ssize_t _Console_simple_Read( for ( i = 0; i < n; ++i ) { int c; - do { + while ( true ) { c = getchark(); - } while (c == -1); + if ( c != -1 ) { + break; + } + + (void) rtems_task_wake_after( 1 ); + } buf[ i ] = (char) c; } |