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[thin] Adopt stateful random number generators

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This commit is contained in:
Ming-Hung Tsai
2020-08-04 11:45:36 +08:00
parent 06dfb976c2
commit 3f19818c56
3 changed files with 39 additions and 9 deletions
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15
base/io_generator.cc
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@@ -1,5 +1,7 @@
#include "base/io_generator.h"
#include "base/sequence_generator.h"
#include <chrono>
#include <random>
#include <stdexcept>
#include <cstdlib>
#include <cstring>
@@ -31,19 +33,23 @@ namespace {
typedef std::shared_ptr<op_generator> ptr;
op_generator(base::req_op op1)
: op1_(op1), op2_(op1), op1_pct_(100) {
: op1_(op1), op2_(op1), op1_pct_(100),
rand_seed_(std::chrono::high_resolution_clock::now().time_since_epoch().count()),
op_engine_(rand_seed_) {
}
op_generator(base::req_op op1,
base::req_op op2,
unsigned op1_pct)
: op1_(op1), op2_(op2), op1_pct_(op1_pct) {
: op1_(op1), op2_(op2), op1_pct_(op1_pct),
rand_seed_(std::chrono::high_resolution_clock::now().time_since_epoch().count()),
op_engine_(rand_seed_) {
if (op1_pct > 100)
throw std::runtime_error("invalid percentage");
}
base::req_op next_op() {
if (static_cast<unsigned>(std::rand()) % 100 > op1_pct_)
if (op_engine_() % 100 > op1_pct_)
return op2_;
return op1_;
}
@@ -52,6 +58,9 @@ namespace {
base::req_op op1_;
base::req_op op2_;
unsigned op1_pct_;
uint64_t rand_seed_;
std::mt19937 op_engine_;
};
//--------------------------------