From 3b0c40044f4c79c75f1778fa601f91848bcdecac Mon Sep 17 00:00:00 2001
From: Alexey Vishnyakov <vishnya@ispras.ru>
Date: Tue, 19 May 2020 19:45:41 +0300
Subject: [PATCH] SINGLE_THREAD: do not use pthread if possible (#4382)

---
 src/api/api_log.cpp      |  6 +++---
 src/sat/sat_parallel.cpp | 18 +++++++++---------
 src/sat/sat_parallel.h   |  4 ++--
 3 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/src/api/api_log.cpp b/src/api/api_log.cpp
index 4269a2c52..942448a7f 100644
--- a/src/api/api_log.cpp
+++ b/src/api/api_log.cpp
@@ -16,18 +16,18 @@ Revision History:
 
 --*/
 #include<fstream>
-#include<mutex>
 #include "api/z3.h"
 #include "api/api_log_macros.h"
 #include "util/util.h"
 #include "util/z3_version.h"
+#include "util/mutex.h"
 
 std::ostream * g_z3_log = nullptr;
 std::atomic<bool> g_z3_log_enabled;
 
 #ifdef Z3_LOG_SYNC
-static std::mutex g_log_mux;
-#define SCOPED_LOCK() std::lock_guard<std::mutex> lock(g_log_mux)
+static mutex g_log_mux;
+#define SCOPED_LOCK() lock_guard lock(g_log_mux)
 #else
 #define SCOPED_LOCK() {}
 #endif
diff --git a/src/sat/sat_parallel.cpp b/src/sat/sat_parallel.cpp
index c783f4636..802c9ce4a 100644
--- a/src/sat/sat_parallel.cpp
+++ b/src/sat/sat_parallel.cpp
@@ -129,7 +129,7 @@ namespace sat {
         if (s.get_config().m_num_threads == 1 || s.m_par_syncing_clauses) return;
         flet<bool> _disable_sync_clause(s.m_par_syncing_clauses, true);
         {
-            std::lock_guard<std::mutex> lock(m_mux);
+            lock_guard lock(m_mux);
             if (limit < m_units.size()) {
                 // this might repeat some literals.
                 out.append(m_units.size() - limit, m_units.c_ptr() + limit);
@@ -150,7 +150,7 @@ namespace sat {
         flet<bool> _disable_sync_clause(s.m_par_syncing_clauses, true);
         IF_VERBOSE(3, verbose_stream() << s.m_par_id << ": share " <<  l1 << " " << l2 << "\n";);
         {
-            std::lock_guard<std::mutex> lock(m_mux);
+            lock_guard lock(m_mux);
             m_pool.begin_add_vector(s.m_par_id, 2);
             m_pool.add_vector_elem(l1.index());
             m_pool.add_vector_elem(l2.index());            
@@ -164,7 +164,7 @@ namespace sat {
         unsigned n = c.size();
         unsigned owner = s.m_par_id;
         IF_VERBOSE(3, verbose_stream() << owner << ": share " <<  c << "\n";);
-        std::lock_guard<std::mutex> lock(m_mux);
+        lock_guard lock(m_mux);
         m_pool.begin_add_vector(owner, n);                
         for (unsigned i = 0; i < n; ++i) {
             m_pool.add_vector_elem(c[i].index());
@@ -175,7 +175,7 @@ namespace sat {
     void parallel::get_clauses(solver& s) {
         if (s.m_par_syncing_clauses) return;
         flet<bool> _disable_sync_clause(s.m_par_syncing_clauses, true);
-        std::lock_guard<std::mutex> lock(m_mux);
+        lock_guard lock(m_mux);
         _get_clauses(s);        
     }
 
@@ -227,12 +227,12 @@ namespace sat {
     }
 
     void parallel::from_solver(solver& s) {
-        std::lock_guard<std::mutex> lock(m_mux);
+        lock_guard lock(m_mux);
         _from_solver(s);        
     }
 
     bool parallel::to_solver(solver& s) {
-        std::lock_guard<std::mutex> lock(m_mux);
+        lock_guard lock(m_mux);
         return _to_solver(s);
     }
 
@@ -254,19 +254,19 @@ namespace sat {
     }
 
     bool parallel::from_solver(i_local_search& s) {
-        std::lock_guard<std::mutex> lock(m_mux);
+        lock_guard lock(m_mux);
         return _from_solver(s);
     }
 
     void parallel::to_solver(i_local_search& s) {
-        std::lock_guard<std::mutex> lock(m_mux);
+        lock_guard lock(m_mux);
         _to_solver(s);               
     }
 
     bool parallel::copy_solver(solver& s) {
         bool copied = false;
         {
-            std::lock_guard<std::mutex> lock(m_mux);
+            lock_guard lock(m_mux);
             m_consumer_ready = true;
             if (m_solver_copy && s.m_clauses.size() > m_solver_copy->m_clauses.size()) {
                 s.copy(*m_solver_copy, true);
diff --git a/src/sat/sat_parallel.h b/src/sat/sat_parallel.h
index e66ac170a..9e331ed95 100644
--- a/src/sat/sat_parallel.h
+++ b/src/sat/sat_parallel.h
@@ -24,7 +24,7 @@ Revision History:
 #include "util/map.h"
 #include "util/rlimit.h"
 #include "util/scoped_ptr_vector.h"
-#include <mutex>
+#include "util/mutex.h"
 
 namespace sat {
 
@@ -62,7 +62,7 @@ namespace sat {
         index_set      m_unit_set;
         literal_vector m_lits;
         vector_pool    m_pool;
-        std::mutex     m_mux;
+        mutex          m_mux;
 
         // for exchange with local search:
         unsigned           m_num_clauses;