get rid of timeb dependencies, pull request #1040

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/util/lp/lp_primal_simplex.h

@@ -55,10 +55,6 @@ public:
     
     void set_core_solver_bounds();
 
-    void update_time_limit_from_starting_time(int start_time) {
-        this->m_settings.time_limit -= (get_millisecond_span(start_time) / 1000.);
-    }
-
     void find_maximal_solution();
 
     void fill_A_x_and_basis_for_stage_one_total_inf();

src/util/lp/lp_primal_simplex.hpp

@@ -152,7 +152,6 @@ template <typename T, typename X> void lp_primal_simplex<T, X>::set_core_solver_
 
 
 template <typename T, typename X> void lp_primal_simplex<T, X>::find_maximal_solution() {
-    int preprocessing_start_time = get_millisecond_count();
     if (this->problem_is_empty()) {
         this->m_status = lp_status::EMPTY;
         return;
@@ -169,7 +168,6 @@ template <typename T, typename X> void lp_primal_simplex<T, X>::find_maximal_sol
     fill_acceptable_values_for_x();
     this->count_slacks_and_artificials();
     set_core_solver_bounds();
-    update_time_limit_from_starting_time(preprocessing_start_time);
     solve_with_total_inf();
 }
 

src/util/lp/lp_settings.h

@@ -8,9 +8,9 @@
 #include <string>
 #include <algorithm>
 #include <limits>
-#include <sys/timeb.h>
 #include <iomanip>
 #include "util/lp/lp_utils.h"
+#include "util/stopwatch.h"
 
 namespace lean {
 typedef unsigned var_index;
@@ -69,10 +69,6 @@ enum non_basic_column_value_position { at_low_bound, at_upper_bound, at_fixed, f
 
 template <typename X> bool is_epsilon_small(const X & v, const double& eps);    // forward definition
 
-int get_millisecond_count();
-int get_millisecond_span(int start_time);
-
-
 class lp_resource_limit {
 public:
     virtual bool get_cancel_flag() = 0;
@@ -92,12 +88,13 @@ struct lp_settings {
 private:
     class default_lp_resource_limit : public lp_resource_limit {
         lp_settings& m_settings;
-        int m_start_time;
+        stopwatch    m_sw;
     public:
-        default_lp_resource_limit(lp_settings& s): m_settings(s), m_start_time(get_millisecond_count()) {}
+        default_lp_resource_limit(lp_settings& s): m_settings(s) {
+            m_sw.start();
+        }
         virtual bool get_cancel_flag() {
-            int span_in_mills = get_millisecond_span(m_start_time);
-            return (span_in_mills / 1000.0  > m_settings.time_limit);
+            return (m_sw.get_current_seconds()  > m_settings.time_limit);
         }
     };
 

src/util/lp/lp_settings.hpp

@@ -52,19 +52,6 @@ lp_status lp_status_from_string(std::string status) {
     lean_unreachable();
     return lp_status::UNKNOWN; // it is unreachable
 }
-int get_millisecond_count() {
-    timeb tb;
-    ftime(&tb);
-    return tb.millitm + (tb.time & 0xfffff) * 1000;
-}
-
-int get_millisecond_span(int start_time) {
-    int span = get_millisecond_count() - start_time;
-    if (span < 0)
-        span += 0x100000 * 1000;
-    return span;
-}
-
 
 
 template <typename T>

src/util/lp/sparse_matrix.hpp

@@ -1050,8 +1050,8 @@ bool sparse_matrix<T, X>::get_pivot_for_column(unsigned &i, unsigned &j, int c_p
         if (i_inv < k) continue;
         unsigned j_inv = adjust_column_inverse(j);
         if (j_inv < k) continue;
-        int small = elem_is_too_small(i, j, c_partial_pivoting);
-        if (!small) {
+        int _small = elem_is_too_small(i, j, c_partial_pivoting);
+        if (!_small) {
 #ifdef LEAN_DEBUG
             // if (!really_best_pivot(i, j, c_partial_pivoting, k)) {
             //     print_active_matrix(k);
@@ -1063,7 +1063,7 @@ bool sparse_matrix<T, X>::get_pivot_for_column(unsigned &i, unsigned &j, int c_p
             j = j_inv;
             return true;
         }
-        if (small != 2) { // 2 means that the pair is not in the matrix
+        if (_small != 2) { // 2 means that the pair is not in the matrix
             pivots_candidates_that_are_too_small.push_back(std::make_pair(i, j));
         }
     }