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# tbb::interface6::runtime_loader Class Reference

Load TBB at runtime. More...

`#include <runtime_loader.h>`

List of all members.

## Public Types
| em_status
| Save status of operation and continue.
| em_throw
| Throw an exception of tbb::runtime_loader::error_code type.
| em_abort
| Print message to `stderr` and call `abort()`.
| ec_ok
| No errors.
| ec_bad_call
| Invalid function call (e. g. load() called when TBB is already loaded).
| ec_bad_arg
| Invalid argument passed.
| ec_bad_lib
| Invalid library found (e. g. `TBB_runtime_version` symbol not found).
| ec_bad_ver
| TBB found but version is not suitable.
| ec_no_lib
| No suitable TBB library found.
enum | error_mode { em_status, em_throw, em_abort }
| Error mode constants. More...
enum | error_code { ec_ok, ec_bad_call, ec_bad_arg, ec_bad_lib, ec_bad_ver, ec_no_lib }
| Error codes. More...
## Public Member Functions
| runtime_loader (error_mode mode=em_abort)
| Initialize object but do not load TBB.
| runtime_loader (char const *path[], int min_ver=TBB_INTERFACE_VERSION, int max_ver=INT_MAX, error_mode mode=em_abort)
| Initialize object and load TBB.
| ~runtime_loader ()
| Destroy object.
error_code | load (char const *path[], int min_ver=TBB_INTERFACE_VERSION, int max_ver=INT_MAX)
| Load TBB.
error_code | status ()
| Report status.

## Detailed Description

Load TBB at runtime.

Usage:

In source code:

    #include "tbb/runtime_loader.h"

    char const * path[] = { "<install dir>/lib/ia32", NULL };
    tbb::runtime_loader loader( path );

    // Now use TBB.

Link with `tbbproxy.lib` (or `libtbbproxy.a`) instead of `tbb.lib` (`libtbb.dylib`, `libtbb.so`).

TBB library will be loaded at runtime from `` <install dir>="">/lib/ia32 directory.

Attention:

All `runtime_loader` objects (in the same module, i.e. exe or dll) share some global state. The most noticeable piece of global state is loaded TBB library. There are some implications:

- Only one TBB library can be loaded per module.

- If one object has already loaded TBB library, another object will not load TBB. If the loaded TBB library is suitable for the second object, both will use TBB cooperatively, otherwise the second object will report an error.

- `runtime_loader` objects will not work (correctly) in parallel due to absence of syncronization.

## Member Enumeration Documentation

enum tbb::interface6::runtime_loader::error_code

Error codes.

Enumerator:

  ec_ok | No errors.
  ec_bad_call | Invalid function call (e. g. load() called when TBB is already loaded).
  ec_bad_arg | Invalid argument passed.
  ec_bad_lib | Invalid library found (e. g. `TBB_runtime_version` symbol not found).
  ec_bad_ver | TBB found but version is not suitable.
  ec_no_lib | No suitable TBB library found.

enum tbb::interface6::runtime_loader::error_mode

Error mode constants.

Enumerator:

  em_status | Save status of operation and continue.
  em_throw | Throw an exception of tbb::runtime_loader::error_code type.
  em_abort | Print message to `stderr` and call `abort()`.

## Constructor & Destructor Documentation

tbb::interface6::runtime_loader::runtime_loader | ( | char const * | path[],
|  | int | min_ver = `TBB_INTERFACE_VERSION`,
|  | int | max_ver = `INT_MAX`,
|  | error_mode | mode = `em_abort` |
| ) |  |  |

Initialize object and load TBB.

See load() for details.

If error mode is `em_status`, call status() to check whether TBB was loaded or not.

Parameters:

  path | List of directories to search TBB in.
  min_ver | Minimal suitable version of TBB.
  max_ver | Maximal suitable version of TBB.
  mode | Error mode for this object.

## Member Function Documentation

error_code tbb::interface6::runtime_loader::load | ( | char const * | path[],
|  | int | min_ver = `TBB_INTERFACE_VERSION`,
|  | int | max_ver = `INT_MAX` |
| ) |  |  |

Load TBB.

The method searches the directories specified in `path`[] array for the TBB library. When the library is found, it is loaded and its version is checked. If the version is not suitable, the library is unloaded, and the search continues.

Note:

For security reasons, avoid using relative directory names. For example, never load TBB from current (`"."`), parent (`".."`) or any other relative directory (like `"lib"` ). Use only absolute directory names (e. g. "/usr/local/lib").

For the same security reasons, avoid using system default directories (`""`) on Windows. (See http://www.microsoft.com/technet/security/advisory/2269637.mspx for details.)

Neglecting these rules may cause your program to execute 3-rd party malicious code.

Errors:

- `ec_bad_call` - TBB already loaded by this object.
- `ec_bad_arg` - `min_ver` and/or `max_ver` negative or zero, or `min_ver` > `max_ver`.
- `ec_bad_ver` - TBB of unsuitable version already loaded by another object.
- `ec_no_lib` - No suitable library found.

Parameters:

  path | List of directories to search TBB in.
  min_ver | Minimal suitable version of TBB.
  max_ver | Maximal suitable version of TBB.

error_code tbb::interface6::runtime_loader::status | ( |  | ) |

Report status.

If error mode is `em_status`, the function returns status of the last operation.

The documentation for this class was generated from the following file:

- runtime_loader.h

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