Are reads/writes to floating point variables atomic?

[asamson]

Hi,

My application has two tasks. The first one updates a floating point variable and the other reads this variable. Do I need to protect access to this variable using a mutex or are read/write accesses atomic in this case?

[ESP_Angus]

If they're 32-bit floats, then any load/store is atomic.

If they're 64-bit doubles, then these are not atomic.