`clear(..)` supports a sync mode

Author: sugarraysamCreated Oct 28, 2024Updated Sep 4, 2026

Labelsgood first issue

I have a map, which I want to delete immediately. The context is I use two maps @curr and @prev, and I am always writing to @curr, and at set intervals, I take the data in @curr and put it in @prev. For this to happen, I want to be able to clear(@curr), but this creates issues as clear(...) only supports async deletion.

bpftrace

#!/usr/bin/bpftrace

// write some data to current
usdt:/some/probe {
    @curr[arg1, arg2]++;
}

// at set interval we rotate buckets
interval:s:10 {
    // we are force to iterate through @curr to delete every entry manually
    // this is the only way to do sync deletion
    for (kv : @curr) {
        delete(@curr[$kv.0]);
    }
    
    <...>
}

Source: bpftrace/bpftrace

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