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Switch to C++ random number generator for history vacuum interval

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This commit is contained in:
ridiculousfish 2020-03-14 15:21:53 -07:00
parent 87b1c02832
commit f9f5775ccc
1 changed files with 7 additions and 4 deletions
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11
src/history.cpp
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@ -14,17 +14,18 @@
// We need the sys/file.h for the flock() declaration on Linux but not OS X.
#include <sys/file.h> // IWYU pragma: keep
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
#include <wctype.h>
#include <algorithm>
#include <atomic>
#include <chrono>
#include <cwchar>
#include <functional>
#include <iterator>
#include <map>
#include <numeric>
#include <random>
#include <type_traits>
#include <unordered_set>
@ -396,10 +397,12 @@ void history_impl_t::save_unless_disabled() {
// the counter.
const int kVacuumFrequency = 25;
if (countdown_to_vacuum < 0) {
unsigned int seed = static_cast<unsigned int>(time(nullptr));
// Generate a number in the range [0, kVacuumFrequency).
srand(seed);
countdown_to_vacuum = rand() / (RAND_MAX / kVacuumFrequency + 1);
std::uniform_int_distribution<unsigned> dist{0, kVacuumFrequency - 1};
unsigned seed =
static_cast<unsigned>(std::chrono::system_clock::now().time_since_epoch().count());
std::minstd_rand gen{seed};
countdown_to_vacuum = dist(gen);
}
// Determine if we're going to vacuum.