diff options
| author | Paulo Zanoni <paulo.r.zanoni@intel.com> | 2014-12-03 16:12:49 -0200 |
|---|---|---|
| committer | Paulo Zanoni <paulo.r.zanoni@intel.com> | 2015-05-05 17:27:49 -0300 |
| commit | 9bb04d3aa6a2b1b86e091967e312a19ce337df4d (patch) | |
| tree | 4bc4ddc0b7f75b5c8156599f36dc08991b223811 /lib/igt_aux.h | |
| parent | a734ac2058fd0cce842a4290335c0697d89b2d63 (diff) | |
lib: add igt_wait()
Just a little helper for code that needs to wait for a certain
condition to happen. It has the nice advantage that it can survive the
signal helper.
Despite the callers added in this patch, there is another that will go
in a separate patch, and another in a new IGT test file that I plan to
push later.
v2: Check COND again before returning in case we hit the timeout.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Diffstat (limited to 'lib/igt_aux.h')
| -rw-r--r-- | lib/igt_aux.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/lib/igt_aux.h b/lib/igt_aux.h index 7a5078b0..b2dc2679 100644 --- a/lib/igt_aux.h +++ b/lib/igt_aux.h @@ -30,6 +30,7 @@ #include <intel_bufmgr.h> #include <stdbool.h> +#include <sys/time.h> extern drm_intel_bo **trash_bos; extern int num_trash_bos; @@ -102,4 +103,46 @@ void intel_require_memory(uint32_t count, uint32_t size, unsigned mode); void igt_lock_mem(size_t size); void igt_unlock_mem(void); +/** + * igt_wait: + * @COND: condition to wait + * @timeout_ms: timeout in milliseconds + * @interval_ms: amount of time we try to sleep between COND checks + * + * Waits until COND evaluates to true or the timeout passes. + * + * It is safe to call this macro if the signal helper is active. The only + * problem is that the usleep() calls will return early, making us evaluate COND + * too often, possibly eating valuable CPU cycles. + * + * Returns: + * True of COND evaluated to true, false otherwise. + */ +#define igt_wait(COND, timeout_ms, interval_ms) ({ \ + struct timeval start_, end_, diff_; \ + int elapsed_ms_; \ + bool ret_ = false; \ + \ + igt_assert(gettimeofday(&start_, NULL) == 0); \ + do { \ + if (COND) { \ + ret_ = true; \ + break; \ + } \ + \ + usleep(interval_ms * 1000); \ + \ + igt_assert(gettimeofday(&end_, NULL) == 0); \ + timersub(&end_, &start_, &diff_); \ + \ + elapsed_ms_ = diff_.tv_sec * 1000 + \ + diff_.tv_usec / 1000; \ + } while (elapsed_ms_ < timeout_ms); \ + \ + if (!ret_ && (COND)) \ + ret_ = true; \ + \ + ret_; \ +}) + #endif /* IGT_AUX_H */ |