ImageGear for C and C++ on Windows v19.10 - Updated
enumThreadLockMode
API Reference Guide > Core Component API Reference > Core Component Enumerations Reference > enumThreadLockMode

Specifies thread access lock modes, used by IG_thread_image_lock and IG_thread_image_unlock functions.

Values:

IG_THREAD_LOCK_READ Thread requested a read lock for the image.
IG_THREAD_LOCK_WRITE Thread requested a write lock for the image.