From 52b8f93e0f69b0ae631a96b3061da7a871e8766e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20K=C3=B6hler?= <info@martinjankoehler.com>
Date: Tue, 13 Aug 2024 16:21:04 +0200
Subject: [PATCH 1/2] Added macOS implementation of portableGetFreeMemory()

wxGetFreeMemory() does not work on UNIX platforms
---
 Solver/Autorefine.cpp | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/Solver/Autorefine.cpp b/Solver/Autorefine.cpp
index 56e2038..982476c 100644
--- a/Solver/Autorefine.cpp
+++ b/Solver/Autorefine.cpp
@@ -37,12 +37,19 @@
 #include <float.h>
 // for _chdir()
 //#include <direct.h>
+
 // for openmp
 #include "omp.h"
 
 // for wxGetFreeMemory()
 #include <wx/utils.h> 
 
+#ifdef __DARWIN__
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#endif
+
+
 #include "SolverGlobal.h"
 
 #include "Autorefine.h"
@@ -106,6 +113,26 @@
 // init static vars
 unsigned long CAutoRefine::m_ulTempFileID = 1;
 
+// wxGetFreeMemory() replacement,
+// as it does not work on UNIX platforms (Linux, macOS, ...)
+wxMemorySize portableGetFreeMemory() {
+    wxMemorySize freeMemory;
+    
+#ifdef __LINUX__
+    // TODO
+#elif __DARWIN__
+    const char *key = "hw.memsize_usable";
+    size_t size = sizeof(freeMemory);
+    if (sysctlbyname(key, &freeMemory, &size, NULL, 0) != 0) {
+        printf("Failed to retrieve free memory using sysctlbyname(): %s\n", strerror(errno));
+    }
+#else
+    freeMemory = wxGetFreeMemory();
+#endif
+    
+    return freeMemory;
+}
+
 CAutoRefine::CAutoRefine()
 {
 	unsigned char i;
@@ -522,7 +549,7 @@ int CAutoRefine::AutoRefineLinks(CAutoRefGlobalVars globalVars)
 	mem_LinksTotal = mem_Potest + mem_pCharge;
 
 	// get available memory
-	mem_AvailVirtual = (wxLongLong) wxGetFreeMemory();
+	mem_AvailVirtual = (wxLongLong) portableGetFreeMemory();
 // debug
 //mem_AvailVirtual = 50000000;
 
@@ -1068,7 +1095,7 @@ void CAutoRefine::DumpMemoryInfo()
 	wxLongLong freeMem;
 
 	// get available memory
-	freeMem = (wxLongLong) wxGetFreeMemory();
+	freeMem = (wxLongLong) portableGetFreeMemory();
 
 	LogMsg("Available virtual memory: %lu kilobytes\n", (freeMem/G_KILOBYTE).ToLong());
 

From 2bfc0dd33caccf9d08bfde821ddf7cfb0eefddb5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20K=C3=B6hler?= <info@martinjankoehler.com>
Date: Tue, 13 Aug 2024 14:52:12 +0000
Subject: [PATCH 2/2] Added Linux implementation for portableGetFreeMemory()

---
 Solver/Autorefine.cpp | 30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

diff --git a/Solver/Autorefine.cpp b/Solver/Autorefine.cpp
index 982476c..5489bc8 100644
--- a/Solver/Autorefine.cpp
+++ b/Solver/Autorefine.cpp
@@ -49,6 +49,11 @@
 #include <sys/sysctl.h>
 #endif
 
+#ifdef __LINUX__
+#include <fstream>
+#include <stdlib.h>
+#endif
+
 
 #include "SolverGlobal.h"
 
@@ -119,8 +124,28 @@ wxMemorySize portableGetFreeMemory() {
     wxMemorySize freeMemory;
     
 #ifdef __LINUX__
-    // TODO
-#elif __DARWIN__
+    // NOTE: unfortunatly, <sys/sysinfo.h> does not include the MemAvailable (only MemFree),
+    //       so we have to parse /proc/meminfo
+    std::ifstream inputStream("/proc/meminfo");
+    std::string keyword("MemAvailable:");
+    std::string suffix(" kB");
+    std::string line;
+    while (std::getline(inputStream, line)) {
+        if (line.substr(0, keyword.size()) == keyword) {
+            if (line.substr(line.size() - suffix.size(), suffix.size()) != suffix) {
+                    std::cerr << "ERROR: expected /proc/meminfo line to end with suffix '" << suffix
+                              << "', but obtained line: " << line << std::endl;
+                    break;
+            }
+            size_t idx = line.find_first_not_of(" ", keyword.size());
+            const std::string memAvail = line.substr(idx, line.size() - idx - suffix.size());
+            freeMemory = strtoul(memAvail.c_str(), NULL, 10);
+	    freeMemory *= 1024;
+            break;
+        }
+    }
+#else
+#ifdef __DARWIN__
     const char *key = "hw.memsize_usable";
     size_t size = sizeof(freeMemory);
     if (sysctlbyname(key, &freeMemory, &size, NULL, 0) != 0) {
@@ -128,6 +153,7 @@ wxMemorySize portableGetFreeMemory() {
     }
 #else
     freeMemory = wxGetFreeMemory();
+#endif
 #endif
     
     return freeMemory;