1 /* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
2 file Copyright.txt or https://cmake.org/licensing for details. */
3 #include "cmDynamicLoader.h"
4
5 #include <map>
6 #include <string>
7 #include <utility>
8
9 namespace {
10 class cmDynamicLoaderCache
11 {
12 public:
13 ~cmDynamicLoaderCache();
14 void CacheFile(const char* path, cmsys::DynamicLoader::LibraryHandle /*p*/);
15 bool GetCacheFile(const char* path,
16 cmsys::DynamicLoader::LibraryHandle& /*p*/);
17 bool FlushCache(const char* path);
18 void FlushCache();
19 static cmDynamicLoaderCache& GetInstance();
20
21 private:
22 std::map<std::string, cmsys::DynamicLoader::LibraryHandle> CacheMap;
23 static cmDynamicLoaderCache Instance;
24 };
25
26 cmDynamicLoaderCache cmDynamicLoaderCache::Instance;
27 }
28
29 cmDynamicLoaderCache::~cmDynamicLoaderCache() = default;
30
CacheFile(const char * path,cmsys::DynamicLoader::LibraryHandle p)31 void cmDynamicLoaderCache::CacheFile(const char* path,
32 cmsys::DynamicLoader::LibraryHandle p)
33 {
34 cmsys::DynamicLoader::LibraryHandle h;
35 if (this->GetCacheFile(path, h)) {
36 this->FlushCache(path);
37 }
38 this->CacheMap[path] = p;
39 }
40
GetCacheFile(const char * path,cmsys::DynamicLoader::LibraryHandle & p)41 bool cmDynamicLoaderCache::GetCacheFile(const char* path,
42 cmsys::DynamicLoader::LibraryHandle& p)
43 {
44 auto it = this->CacheMap.find(path);
45 if (it != this->CacheMap.end()) {
46 p = it->second;
47 return true;
48 }
49 return false;
50 }
51
FlushCache(const char * path)52 bool cmDynamicLoaderCache::FlushCache(const char* path)
53 {
54 auto it = this->CacheMap.find(path);
55 bool ret = false;
56 if (it != this->CacheMap.end()) {
57 cmsys::DynamicLoader::CloseLibrary(it->second);
58 this->CacheMap.erase(it);
59 ret = true;
60 }
61 return ret;
62 }
63
FlushCache()64 void cmDynamicLoaderCache::FlushCache()
65 {
66 for (auto const& it : this->CacheMap) {
67 cmsys::DynamicLoader::CloseLibrary(it.second);
68 }
69 this->CacheMap.clear();
70 }
71
GetInstance()72 cmDynamicLoaderCache& cmDynamicLoaderCache::GetInstance()
73 {
74 return cmDynamicLoaderCache::Instance;
75 }
76
OpenLibrary(const char * libname)77 cmsys::DynamicLoader::LibraryHandle cmDynamicLoader::OpenLibrary(
78 const char* libname)
79 {
80 cmsys::DynamicLoader::LibraryHandle lh;
81 if (cmDynamicLoaderCache::GetInstance().GetCacheFile(libname, lh)) {
82 return lh;
83 }
84 lh = cmsys::DynamicLoader::OpenLibrary(libname);
85 cmDynamicLoaderCache::GetInstance().CacheFile(libname, lh);
86 return lh;
87 }
88
FlushCache()89 void cmDynamicLoader::FlushCache()
90 {
91 cmDynamicLoaderCache::GetInstance().FlushCache();
92 }
93