---
name: "ACE_Thread_Strategy"
section: "3"
platform: "linux"
package: "libace-doc"
version: "5.0.7-4"
release: "Debian 2.2 (Potato)"
platforms: ["linux"]
url: "https://new.carta.tech/ACE_Thread_Strategy"
---

# ACE\_Thread\_Strategy(3)

Defines the interface for specifying a concurrency strategy for a SVC\_HANDLER based on multithreading.

## NAME

ACE\_Thread\_Strategy -  Defines the interface for specifying a concurrency strategy for a SVC\_HANDLER based on multithreading.

## SYNOPSIS

```
#include <ace/ACE_Strategies_T.h>
template<class SVC_HANDLER>
class ACE_Thread_Strategy :
  public ACE_Concurrency_Strategy<SVC_HANDLER>
{
  public:
    ACE_Thread_Strategy (int flags = 0);
    ACE_Thread_Strategy (
        ACE_Thread_Manager *tm,
        long thr_flags,
        size_t n_threads = 1,
        int flags = 0
        );
    virtual int open (
        ACE_Thread_Manager *tm,
        long thr_flags,
        size_t n_threads = 1,
        int flags = 0
        );
    virtual ~ACE_Thread_Strategy (void);
    virtual int activate_svc_handler (
        SVC_HANDLER *svc_handler,
        void *arg = 0
        );
    void dump (void) const;
    ACE_ALLOC_HOOK_DECLARE;
  protected:
    typedef ACE_Concurrency_Strategy<SVC_HANDLER> inherited;
    ACE_Thread_Manager *thr_mgr_;
    long thr_flags_;
    size_t n_threads_;
};
```

## DESCRIPTION

This class provides a strategy that manages the creation of threads to handle requests from clients concurrently.  It behaves as a "thread factory", spawning threads "on-demand" to run the service specified by a user-supplied SVC\_HANDLER.

## Intialization and termination methods.

```
ACE_Thread_Strategy (int flags = 0);
```

"Do-nothing constructor"

```
ACE_Thread_Strategy (
    ACE_Thread_Manager *tm,
    long thr_flags,
    size_t n_threads = 1,
    int flags = 0
    );
```

Initialize the strategy.

```
virtual int open (
    ACE_Thread_Manager *tm,
    long thr_flags,
    size_t n_threads = 1,
    int flags = 0
    );
```

Initialize the strategy.

```
virtual ~ACE_Thread_Strategy (void);
```

## Factory method.

```
virtual int activate_svc_handler (
    SVC_HANDLER *svc_handler,
    void *arg = 0
    );
```

Activate the svc\_handler with an appropriate concurrency strategy.  This method activates the SVC\_HANDLER by first calling its open method and then calling its activate method to turn it into an active object.

```
void dump (void) const;
```

Dump the state of an object.

```
ACE_ALLOC_HOOK_DECLARE;
```

Declare the dynamic allocation hooks.

## AUTHOR

Doug Schmidt

## LIBRARY

ace