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shared: Add helpers to convert between various time units and timespec

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Add helper functions to make it easy and less error-prone to convert
between values in various time units (nsec, usec, msec) and struct
timespec. These helpers are going to be used in the upcoming commits to
transition the Weston codebase to struct timespec.

Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
This commit is contained in:
Alexandros Frantzis 2017-11-16 18:20:51 +02:00 committed by Pekka Paalanen
parent e2a5f9e02d
commit 6c2752a863
2 changed files with 119 additions and 0 deletions
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47
shared/timespec-util.h
View File

@ -134,6 +134,53 @@ timespec_sub_to_msec(const struct timespec *a, const struct timespec *b)
return timespec_sub_to_nsec(a, b) / 1000000;
}
/* Convert timespec to microseconds
*
* \param a timespec
* \return microseconds
*
* Rounding to integer microseconds happens always down (floor()).
*/
static inline int64_t
timespec_to_usec(const struct timespec *a)
{
return (int64_t)a->tv_sec * 1000000 + a->tv_nsec / 1000;
}
/* Convert nanoseconds to timespec
*
* \param a timespec
* \param b nanoseconds
*/
static inline void
timespec_from_nsec(struct timespec *a, int64_t b)
{
a->tv_sec = b / NSEC_PER_SEC;
a->tv_nsec = b % NSEC_PER_SEC;
}
/* Convert microseconds to timespec
*
* \param a timespec
* \param b microseconds
*/
static inline void
timespec_from_usec(struct timespec *a, int64_t b)
{
timespec_from_nsec(a, b * 1000);
}
/* Convert milliseconds to timespec
*
* \param a timespec
* \param b milliseconds
*/
static inline void
timespec_from_msec(struct timespec *a, int64_t b)
{
timespec_from_nsec(a, b * 1000000);
}
/* Check if a timespec is zero
*
* \param a timespec

72
tests/timespec-test.c
View File

@ -60,6 +60,15 @@ ZUC_TEST(timespec_test, timespec_to_nsec)
ZUC_ASSERT_EQ(timespec_to_nsec(&a), (NSEC_PER_SEC * 4ULL) + 4);
}
ZUC_TEST(timespec_test, timespec_to_usec)
{
struct timespec a;
a.tv_sec = 4;
a.tv_nsec = 4000;
ZUC_ASSERT_EQ(timespec_to_usec(&a), (4000000ULL) + 4);
}
ZUC_TEST(timespec_test, timespec_to_msec)
{
struct timespec a;
@ -165,6 +174,69 @@ ZUC_TEST(timespec_test, timespec_sub_to_msec)
ZUC_ASSERT_EQ((998 * 1000) + 1, timespec_sub_to_msec(&a, &b));
}
ZUC_TEST(timespec_test, timespec_from_nsec)
{
struct timespec a;
timespec_from_nsec(&a, 0);
ZUC_ASSERT_EQ(0, a.tv_sec);
ZUC_ASSERT_EQ(0, a.tv_nsec);
timespec_from_nsec(&a, NSEC_PER_SEC - 1);
ZUC_ASSERT_EQ(0, a.tv_sec);
ZUC_ASSERT_EQ(NSEC_PER_SEC - 1, a.tv_nsec);
timespec_from_nsec(&a, NSEC_PER_SEC);
ZUC_ASSERT_EQ(1, a.tv_sec);
ZUC_ASSERT_EQ(0, a.tv_nsec);
timespec_from_nsec(&a, (5L * NSEC_PER_SEC) + 1);
ZUC_ASSERT_EQ(5, a.tv_sec);
ZUC_ASSERT_EQ(1, a.tv_nsec);
}
ZUC_TEST(timespec_test, timespec_from_usec)
{
struct timespec a;
timespec_from_usec(&a, 0);
ZUC_ASSERT_EQ(0, a.tv_sec);
ZUC_ASSERT_EQ(0, a.tv_nsec);
timespec_from_usec(&a, 999999);
ZUC_ASSERT_EQ(0, a.tv_sec);
ZUC_ASSERT_EQ(999999 * 1000, a.tv_nsec);
timespec_from_usec(&a, 1000000);
ZUC_ASSERT_EQ(1, a.tv_sec);
ZUC_ASSERT_EQ(0, a.tv_nsec);
timespec_from_usec(&a, 5000001);
ZUC_ASSERT_EQ(5, a.tv_sec);
ZUC_ASSERT_EQ(1000, a.tv_nsec);
}
ZUC_TEST(timespec_test, timespec_from_msec)
{
struct timespec a;
timespec_from_msec(&a, 0);
ZUC_ASSERT_EQ(0, a.tv_sec);
ZUC_ASSERT_EQ(0, a.tv_nsec);
timespec_from_msec(&a, 999);
ZUC_ASSERT_EQ(0, a.tv_sec);
ZUC_ASSERT_EQ(999 * 1000000, a.tv_nsec);
timespec_from_msec(&a, 1000);
ZUC_ASSERT_EQ(1, a.tv_sec);
ZUC_ASSERT_EQ(0, a.tv_nsec);
timespec_from_msec(&a, 5001);
ZUC_ASSERT_EQ(5, a.tv_sec);
ZUC_ASSERT_EQ(1000000, a.tv_nsec);
}
ZUC_TEST(timespec_test, timespec_is_zero)
{
struct timespec zero = { 0 };