Also release the GIL when opening a file,

this is a potentially long-running blocking IO operation.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/exiv2wrapper.cpp b/src/exiv2wrapper.cpp
index f5e6b80..4a3f0f6 100644
--- a/src/exiv2wrapper.cpp
+++ b/src/exiv2wrapper.cpp
@@ -40,19 +40,33 @@ namespace exiv2wrapper
 // Base constructor
 Image::Image(const std::string& filename)
 {
+    // Release the GIL to allow other python threads to run
+    // while opening the file.
+    Py_BEGIN_ALLOW_THREADS
+
     _filename = filename;
     _image = Exiv2::ImageFactory::open(filename);
     assert(_image.get() != 0);
     _dataRead = false;
+
+    // Re-acquire the GIL
+    Py_END_ALLOW_THREADS
 }
 
 // Copy constructor
 Image::Image(const Image& image)
 {
+    // Release the GIL to allow other python threads to run
+    // while opening the file.
+    Py_BEGIN_ALLOW_THREADS
+
     _filename = image._filename;
     _image = Exiv2::ImageFactory::open(_filename);
     assert(_image.get() != 0);
     _dataRead = false;
+
+    // Re-acquire the GIL
+    Py_END_ALLOW_THREADS
 }
 
 void Image::readMetadata()