Question about thread support

[zhcn381]

hi all,

Why process like GetImageEncoder() and GetImageDecoder() need to be mutex protected if no thread_support?

[magick]

Assume a user program that reads multiple jpeg images, each in a different thread. The JPEG library does not support threading, so ImageMagick must ensure only one of these threads access the JPEG library at a time. Without the mutex, it is possible that multiple instances of the JPEG library will run in parallel causing an unknown run-time exception.

[zhcn381]

thank you magick.