log_trace: add a in-mem-log example

After `log_trace_init()`, call `memlog_init`. It then turn the logtrace
into a "in-memory" logger which will buffer all the log in memory. It
also set a hook in idle to flush all the log into console. One may
create an other thread to flush the logs but idle might be the simplest
place to go.
This commit is contained in:
Grissiom 2013-10-23 01:48:47 +08:00
parent 0feefc03b6
commit a391e0a893
1 changed files with 52 additions and 0 deletions

View File

@ -0,0 +1,52 @@
#include <rtthread.h>
#include <rtdevice.h>
#include <log_trace.h>
#define PIPE_SZ 2048
#define PIPE_NAME "lgpipe"
static rt_uint8_t pipebuf[PIPE_SZ];
static struct rt_pipe_device pipedev;
static rt_uint8_t outbuf[1024];
void memlog_flush(void)
{
rt_size_t remainsz, readsz;
rt_device_t console;
console = rt_console_get_device();
if (!console)
return;
rt_device_control((rt_device_t)&pipedev, PIPE_CTRL_GET_SPACE, &remainsz);
if (remainsz == 0)
{
rt_kprintf("logtrace pipe "PIPE_NAME" is full, some log may lost\n");
}
readsz = rt_device_read((rt_device_t)&pipedev, 0, outbuf, sizeof(outbuf));
if (readsz)
rt_device_write(console, 0, outbuf, readsz);
}
void memlog_init(void)
{
rt_err_t res;
/* make sure the RT_PIPE_FLAG_BLOCK_RD is not set. The Idle should not be
* blocked. RT_PIPE_FLAG_FORCE_WR will let the pipe discard some old data
* when pipe is full. */
res = rt_pipe_init(&pipedev, PIPE_NAME, RT_PIPE_FLAG_FORCE_WR,
pipebuf, sizeof(pipebuf));
if (res != RT_EOK)
{
rt_kprintf("init pipe device failed: %d\n", res);
return;
}
log_trace_set_device(PIPE_NAME);
rt_thread_idle_sethook(memlog_flush);
}