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Filename : index.mjs
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const E_TIMEOUT = new Error('timeout while waiting for mutex to become available');
const E_ALREADY_LOCKED = new Error('mutex already locked');
const E_CANCELED = new Error('request for lock canceled');

var __awaiter$2 = (undefined && undefined.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
class Semaphore {
    constructor(_value, _cancelError = E_CANCELED) {
        this._value = _value;
        this._cancelError = _cancelError;
        this._queue = [];
        this._weightedWaiters = [];
    }
    acquire(weight = 1, priority = 0) {
        if (weight <= 0)
            throw new Error(`invalid weight ${weight}: must be positive`);
        return new Promise((resolve, reject) => {
            const task = { resolve, reject, weight, priority };
            const i = findIndexFromEnd(this._queue, (other) => priority <= other.priority);
            if (i === -1 && weight <= this._value) {
                // Needs immediate dispatch, skip the queue
                this._dispatchItem(task);
            }
            else {
                this._queue.splice(i + 1, 0, task);
            }
        });
    }
    runExclusive(callback_1) {
        return __awaiter$2(this, arguments, void 0, function* (callback, weight = 1, priority = 0) {
            const [value, release] = yield this.acquire(weight, priority);
            try {
                return yield callback(value);
            }
            finally {
                release();
            }
        });
    }
    waitForUnlock(weight = 1, priority = 0) {
        if (weight <= 0)
            throw new Error(`invalid weight ${weight}: must be positive`);
        if (this._couldLockImmediately(weight, priority)) {
            return Promise.resolve();
        }
        else {
            return new Promise((resolve) => {
                if (!this._weightedWaiters[weight - 1])
                    this._weightedWaiters[weight - 1] = [];
                insertSorted(this._weightedWaiters[weight - 1], { resolve, priority });
            });
        }
    }
    isLocked() {
        return this._value <= 0;
    }
    getValue() {
        return this._value;
    }
    setValue(value) {
        this._value = value;
        this._dispatchQueue();
    }
    release(weight = 1) {
        if (weight <= 0)
            throw new Error(`invalid weight ${weight}: must be positive`);
        this._value += weight;
        this._dispatchQueue();
    }
    cancel() {
        this._queue.forEach((entry) => entry.reject(this._cancelError));
        this._queue = [];
    }
    _dispatchQueue() {
        this._drainUnlockWaiters();
        while (this._queue.length > 0 && this._queue[0].weight <= this._value) {
            this._dispatchItem(this._queue.shift());
            this._drainUnlockWaiters();
        }
    }
    _dispatchItem(item) {
        const previousValue = this._value;
        this._value -= item.weight;
        item.resolve([previousValue, this._newReleaser(item.weight)]);
    }
    _newReleaser(weight) {
        let called = false;
        return () => {
            if (called)
                return;
            called = true;
            this.release(weight);
        };
    }
    _drainUnlockWaiters() {
        if (this._queue.length === 0) {
            for (let weight = this._value; weight > 0; weight--) {
                const waiters = this._weightedWaiters[weight - 1];
                if (!waiters)
                    continue;
                waiters.forEach((waiter) => waiter.resolve());
                this._weightedWaiters[weight - 1] = [];
            }
        }
        else {
            const queuedPriority = this._queue[0].priority;
            for (let weight = this._value; weight > 0; weight--) {
                const waiters = this._weightedWaiters[weight - 1];
                if (!waiters)
                    continue;
                const i = waiters.findIndex((waiter) => waiter.priority <= queuedPriority);
                (i === -1 ? waiters : waiters.splice(0, i))
                    .forEach((waiter => waiter.resolve()));
            }
        }
    }
    _couldLockImmediately(weight, priority) {
        return (this._queue.length === 0 || this._queue[0].priority < priority) &&
            weight <= this._value;
    }
}
function insertSorted(a, v) {
    const i = findIndexFromEnd(a, (other) => v.priority <= other.priority);
    a.splice(i + 1, 0, v);
}
function findIndexFromEnd(a, predicate) {
    for (let i = a.length - 1; i >= 0; i--) {
        if (predicate(a[i])) {
            return i;
        }
    }
    return -1;
}

var __awaiter$1 = (undefined && undefined.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
class Mutex {
    constructor(cancelError) {
        this._semaphore = new Semaphore(1, cancelError);
    }
    acquire() {
        return __awaiter$1(this, arguments, void 0, function* (priority = 0) {
            const [, releaser] = yield this._semaphore.acquire(1, priority);
            return releaser;
        });
    }
    runExclusive(callback, priority = 0) {
        return this._semaphore.runExclusive(() => callback(), 1, priority);
    }
    isLocked() {
        return this._semaphore.isLocked();
    }
    waitForUnlock(priority = 0) {
        return this._semaphore.waitForUnlock(1, priority);
    }
    release() {
        if (this._semaphore.isLocked())
            this._semaphore.release();
    }
    cancel() {
        return this._semaphore.cancel();
    }
}

var __awaiter = (undefined && undefined.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
function withTimeout(sync, timeout, timeoutError = E_TIMEOUT) {
    return {
        acquire: (weightOrPriority, priority) => {
            let weight;
            if (isSemaphore(sync)) {
                weight = weightOrPriority;
            }
            else {
                weight = undefined;
                priority = weightOrPriority;
            }
            if (weight !== undefined && weight <= 0) {
                throw new Error(`invalid weight ${weight}: must be positive`);
            }
            return new Promise((resolve, reject) => __awaiter(this, void 0, void 0, function* () {
                let isTimeout = false;
                const handle = setTimeout(() => {
                    isTimeout = true;
                    reject(timeoutError);
                }, timeout);
                try {
                    const ticket = yield (isSemaphore(sync)
                        ? sync.acquire(weight, priority)
                        : sync.acquire(priority));
                    if (isTimeout) {
                        const release = Array.isArray(ticket) ? ticket[1] : ticket;
                        release();
                    }
                    else {
                        clearTimeout(handle);
                        resolve(ticket);
                    }
                }
                catch (e) {
                    if (!isTimeout) {
                        clearTimeout(handle);
                        reject(e);
                    }
                }
            }));
        },
        runExclusive(callback, weight, priority) {
            return __awaiter(this, void 0, void 0, function* () {
                let release = () => undefined;
                try {
                    const ticket = yield this.acquire(weight, priority);
                    if (Array.isArray(ticket)) {
                        release = ticket[1];
                        return yield callback(ticket[0]);
                    }
                    else {
                        release = ticket;
                        return yield callback();
                    }
                }
                finally {
                    release();
                }
            });
        },
        release(weight) {
            sync.release(weight);
        },
        cancel() {
            return sync.cancel();
        },
        waitForUnlock: (weightOrPriority, priority) => {
            let weight;
            if (isSemaphore(sync)) {
                weight = weightOrPriority;
            }
            else {
                weight = undefined;
                priority = weightOrPriority;
            }
            if (weight !== undefined && weight <= 0) {
                throw new Error(`invalid weight ${weight}: must be positive`);
            }
            return new Promise((resolve, reject) => {
                const handle = setTimeout(() => reject(timeoutError), timeout);
                (isSemaphore(sync)
                    ? sync.waitForUnlock(weight, priority)
                    : sync.waitForUnlock(priority)).then(() => {
                    clearTimeout(handle);
                    resolve();
                });
            });
        },
        isLocked: () => sync.isLocked(),
        getValue: () => sync.getValue(),
        setValue: (value) => sync.setValue(value),
    };
}
function isSemaphore(sync) {
    return sync.getValue !== undefined;
}

// eslint-disable-next-lisne @typescript-eslint/explicit-module-boundary-types
function tryAcquire(sync, alreadyAcquiredError = E_ALREADY_LOCKED) {
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    return withTimeout(sync, 0, alreadyAcquiredError);
}

export { E_ALREADY_LOCKED, E_CANCELED, E_TIMEOUT, Mutex, Semaphore, tryAcquire, withTimeout };