forked from lix-project/lix
Remove Lazy
This fixes a crash during startup when compiling Nix as a single compilation unit.
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87157b2bd3
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e845d19ae3
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@ -1,48 +0,0 @@
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#include <exception>
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#include <functional>
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#include <mutex>
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namespace nix {
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/* A helper class for lazily-initialized variables.
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Lazy<T> var([]() { return value; });
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declares a variable of type T that is initialized to 'value' (in a
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thread-safe way) on first use, that is, when var() is first
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called. If the initialiser code throws an exception, then all
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subsequent calls to var() will rethrow that exception. */
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template<typename T>
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class Lazy
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{
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typedef std::function<T()> Init;
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Init init;
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std::once_flag done;
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T value;
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std::exception_ptr ex;
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public:
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Lazy(Init init) : init(init)
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{ }
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const T & operator () ()
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{
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std::call_once(done, [&]() {
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try {
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value = init();
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} catch (...) {
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ex = std::current_exception();
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}
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});
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if (ex) std::rethrow_exception(ex);
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return value;
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}
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};
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}
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@ -1,4 +1,3 @@
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#include "lazy.hh"
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#include "util.hh"
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#include "affinity.hh"
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#include "sync.hh"
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@ -522,21 +521,24 @@ std::string getUserName()
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}
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static Lazy<Path> getHome2([]() {
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auto homeDir = getEnv("HOME");
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if (!homeDir) {
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std::vector<char> buf(16384);
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struct passwd pwbuf;
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struct passwd * pw;
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if (getpwuid_r(geteuid(), &pwbuf, buf.data(), buf.size(), &pw) != 0
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|| !pw || !pw->pw_dir || !pw->pw_dir[0])
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throw Error("cannot determine user's home directory");
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homeDir = pw->pw_dir;
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}
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return *homeDir;
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});
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Path getHome() { return getHome2(); }
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Path getHome()
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{
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static Path homeDir = []()
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{
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auto homeDir = getEnv("HOME");
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if (!homeDir) {
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std::vector<char> buf(16384);
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struct passwd pwbuf;
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struct passwd * pw;
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if (getpwuid_r(geteuid(), &pwbuf, buf.data(), buf.size(), &pw) != 0
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|| !pw || !pw->pw_dir || !pw->pw_dir[0])
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throw Error("cannot determine user's home directory");
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homeDir = pw->pw_dir;
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}
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return *homeDir;
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}();
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return homeDir;
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}
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Path getCacheDir()
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