diff options
Diffstat (limited to 'libbuild2/module.hxx')
| -rw-r--r-- | libbuild2/module.hxx | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/libbuild2/module.hxx b/libbuild2/module.hxx index 3aaa1c7..50ca7da 100644 --- a/libbuild2/module.hxx +++ b/libbuild2/module.hxx @@ -10,6 +10,7 @@ #include <libbuild2/types.hxx> #include <libbuild2/utility.hxx> +#include <libbuild2/context.hxx> #include <libbuild2/variable.hxx> #include <libbuild2/diagnostics.hxx> @@ -153,6 +154,38 @@ namespace build2 // found. // using loaded_module_map = std::map<string, const module_functions*>; + + // The loaded_modules map is locked per top-level (as opposed to nested) + // context (see context.hxx for details). + // + // Note: should only be constructed during context-wide serial execution. + // + class LIBBUILD2_SYMEXPORT loaded_modules_lock + { + public: + explicit + loaded_modules_lock (context& c) + : ctx_ (c), lock_ (mutex_, defer_lock) + { + if (ctx_.modules_lock == nullptr) + { + lock_.lock (); + ctx_.modules_lock = this; + } + } + + ~loaded_modules_lock () + { + if (ctx_.modules_lock == this) + ctx_.modules_lock = nullptr; + } + + private: + static mutex mutex_; + context& ctx_; + mlock lock_; + }; + LIBBUILD2_SYMEXPORT extern loaded_module_map loaded_modules; // Load a builtin module (i.e., a module linked as a static/shared library |