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use core:lang;
/**
* Explicit barriers.
*
* We support three types of barriers:
* - acquire
* - release
* - full (acquire + release, sequentially consistent)
*
* The runtime takes them into account from two places:
* 1. From SrcBarrier instances inserted as metadata in the listing.
* 2. From the CodeHints class. When a function call without a Barrier instance is encountered,
* the function 'functionBarrier' is called to determine the semantics. This allows an
* implementation to hide calls to internal helper functions, and properly treat library- or
* external functions as hidden. This will not be done for functions that are patched
* (as decided by 'patchExternal'). These barriers are inserted right before the function
* call. Thus, an implementation that inserts barriers itself should return "none"
* for the relevant functions in CodeHints.
*/
enum Barrier : bitmask {
none = 0,
acquire = 1,
release = 2,
full = 3,
// Is this a function call where the call itself should be shown?
showCall = 32,
}
/**
* A barrier located in source code. Also provides location information.
*/
class SrcBarrier {
init(Barrier type, SrcPos pos) {
init {
type = type;
pos = pos;
}
}
Barrier type;
SrcPos pos;
void toS(StrBuf to) : override {
to << "Barrier: " << type << "@" << pos;
}
}
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