#include <task_set.h>
Inherits TaskSetBase.
ConcurrentTaskSet fulfills the same API as TaskSet with one minor difference: It may be used to schedule tasks concurrently from multiple threads (see more below). It is an object that allows scheduling multiple function-like objects to a thread pool, and allows to wait on that set of tasks.
ConcurrentTaskSet is "thread-compatible". This means that you can safely use different ConcurrentTaskSet objects on different threads concurrently. ConcurrentTaskSet also allows multiple threads to concurrently schedule against it. It is an error to call wait() concurrently with schedule() on the same ConcurrentTaskSet.
- Examples
- graph_example.cpp, latch_example.cpp, and task_set_example.cpp.
Definition at line 181 of file task_set.h.
◆ ConcurrentTaskSet() [1/3]
| dispenso::ConcurrentTaskSet::ConcurrentTaskSet |
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ThreadPool & | pool, |
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ParentCascadeCancel | registerForParentCancel, |
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ssize_t | stealingLoadMultiplier = kDefaultStealingMultiplier ) |
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inline |
Construct a ConcurrentTaskSet with the given backing pool.
- Parameters
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| pool | The backing pool for this ConcurrentTaskSet |
| registerForParentCancel | Whether to register for parent cancellation cascade. |
| stealingLoadMultiplier | An over-load factor. If this factor of load is reached by the underlying pool, scheduled tasks may run immediately in the calling thread. |
Definition at line 191 of file task_set.h.
◆ ConcurrentTaskSet() [2/3]
| dispenso::ConcurrentTaskSet::ConcurrentTaskSet |
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ThreadPool & | p | ) |
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inline |
◆ ConcurrentTaskSet() [3/3]
| dispenso::ConcurrentTaskSet::ConcurrentTaskSet |
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ThreadPool & | p, |
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ssize_t | stealingLoadMultiplier ) |
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inline |
Construct a ConcurrentTaskSet with custom load multiplier.
- Parameters
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| p | The backing pool. |
| stealingLoadMultiplier | The over-load factor. |
Definition at line 202 of file task_set.h.
◆ ~ConcurrentTaskSet()
| dispenso::ConcurrentTaskSet::~ConcurrentTaskSet |
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inline |
◆ cancel()
| void dispenso::ConcurrentTaskSet::cancel |
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inline |
◆ canceled()
| bool dispenso::ConcurrentTaskSet::canceled |
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const |
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inline |
◆ schedule() [1/2]
template<typename F >
| void dispenso::ConcurrentTaskSet::schedule |
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F && | f, |
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bool | skipRecheck = false ) |
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inline |
Schedule a functor for execution on the underlying pool. If the load on the underlying pool is high, immediate inline execution may occur on the current thread.
- Parameters
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| f | A functor matching signature void(). Best performance will come from passing lambdas, other concrete functors, or OnceFunction, but std::function or similarly type-erased objects will also work. |
| skipRecheck | A poweruser knob that says that if we don't have enough outstanding tasks to immediately work steal, we should bypass the similar check in the ThreadPool. |
- Note
- If
f can throw exceptions, then schedule may throw if the task is run inline. Otherwise, exceptions will be caught on the running thread and best-effort propagated to the ConcurrentTaskSet, where the first one from the set is rethrown in wait.
- Examples
- latch_example.cpp, and task_set_example.cpp.
Definition at line 226 of file task_set.h.
◆ schedule() [2/2]
template<typename F >
| void dispenso::ConcurrentTaskSet::schedule |
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F && | f, |
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ForceQueuingTag | fq ) |
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inline |
Schedule a functor for execution on the underlying pool.
- Parameters
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| f | A functor matching signature void(). Best performance will come from passing lambdas, other concrete functors, or OnceFunction, but std::function or similarly type-erased objects will also work. |
| fq | Tag to force queuing instead of potential inline execution. |
- Note
- If
f can throw exceptions, then exceptions will be caught on the running thread and best-effort propagated to the ConcurrentTaskSet, where the first one from the set is rethrown in wait.
Definition at line 251 of file task_set.h.
◆ tryWait()
| DISPENSO_DLL_ACCESS bool dispenso::ConcurrentTaskSet::tryWait |
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size_t | maxToExecute | ) |
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See if the currently scheduled functors can be completed while stealing and executing at most maxToExecute of them from the pool. If not used in conjunction with wait, there may be cases that tryWait must be called multiple times with maxToExecute > 0 to prevent livelock/deadlock. If exceptions have been propagated since the last call to wait or tryWait, tryWait will propagate the first of them.
- Parameters
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| maxToExecute | The maximum number of tasks to proactively execute on the current thread. |
- Returns
true if all currently scheduled functors have been completed prior to returning, and false otherwise (including cancelled cases).
◆ wait()
| DISPENSO_DLL_ACCESS bool dispenso::ConcurrentTaskSet::wait |
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Wait for all currently scheduled functors to finish execution. If exceptions are thrown during execution of the set of tasks, wait will propagate the first exception.
- Examples
- latch_example.cpp, and task_set_example.cpp.
The documentation for this class was generated from the following file:
1.12.0