Strands

import ballerina/io;

public function main() {
    // By default, named workers are multitasked cooperatively, not preemptively.
    // Each named worker has a "strand" (logical thread of control) and execution
    // switches between strands only at specific "yield" points.
    worker A {
        io:println("In worker A");
    }

    // An annotation can be used to make a strand run on a separate thread.
    @strand {
        thread: "any"
    }

    worker B {
        io:println("In worker B");
    }

    io:println("In function worker");
}

Strands

By default, named workers are multitasked cooperatively, not preemptively. Each named worker has a “strand” (logical thread of control) and execution switches between strands only at specific “yield” points such as doing a wait or when a library function invokes a system call that would block. This avoids the need for users to lock variables that are accessed from multiple named workers. An annotation can be used to make a strand run on a separate thread.

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Waiting for workers

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Named worker return values

import ballerina/io;

public function main() {

    worker A {
        io:println("In worker A");
    }

By default, named workers are multitasked cooperatively, not preemptively. Each named worker has a “strand” (logical thread of control) and execution switches between strands only at specific “yield” points.

    @strand {
        thread: "any"
    }

An annotation can be used to make a strand run on a separate thread.

    worker B {
        io:println("In worker B");
    }

    io:println("In function worker");
}

bal run strands.bal
In worker B
In function worker
In worker A