Add ability to run a function on a given thread #1119

Job	Run time
macos-x86_64	6h 0m 16s
ios-arm64	3m 18s
gir	2m 57s
linux-mips (mips, g++-mips-linux-gnu)	1m 12s
freebsd-arm64	1m 49s
linux-mips (mipsel, g++-mipsel-linux-gnu)	1m 18s
linux-x86_64	2m 29s
linux-x86	2m 47s
linux-mips (mips64, g++-mips64-linux-gnuabi64)	1m 33s
windows (amd64_x86)	6h 0m 0s
linux-mips (mips64el, g++-mips64el-linux-gnuabi64)	1m 18s
windows (amd64)	6h 0m 1s
android-arm (arm)	1m 50s
android-arm (arm64)	1m 56s
qnx-armeabi	2m 23s
android-intel (x86)	7m 20s
android-intel (x86_64)	5m 23s
	18h 37m 50s

Provide feedback